Physics Made Easy-Fleming's Right Hand Rule

Video with animation of a conductor movement, explains Fleming's Right Hand Rule in a clear 3-axis format and there should not be any confusion in the mind between Right Hand Rule and Left Hand Rule.
The Right Hand Rule applies to all Electrical Generators, where INPUT is Motion, as well as a Magnetic Field direction, and OUTPUT is Current (AC or DC current/voltage can be output). That's the job of any Generator.
That is why in the Right Hand Rule, the INPUT force is shown by the THUMB, it causes Motion of conductor. Next , the direction of Magnetic Field is fixed depending on how you place the North Pole and South Pole. The Field direction will always "flow" from North towards South Pole. This direction is shown by FOREFINGER.
Then, we get our OUTPUT as INDUCED CURRENT. The meaning of this is that a current gets created. The magic here is that by moving something, you get a current. Hence, the current which did not exist before, now got induced to FLOW. That also means there is a Voltage difference between two points on the conductor. We get both current and voltage. (either a DC or AC depending on how the Generator Slip Rings are made).
This direction of Induced Current is shown by the MIDDLE FINGER.
Now, you can't get the directions correctly if you use the Left Hand, you have to use the Right Hand only, to get the correct directions for a Generator situation.
For all Electric Motors, whether DC or AC, it does'nt matter, we have to use the LEFT HAND RULE. That becomes the Left Hand Rule, which is covered in a separate video. Thanks, everyone. Have a good day.
Check out the magnets, magnetic field direction, copper conductor moving up, and final output being the direction of INDUCED CURRENT through the wire.
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Best explanation on the internet, Please watch: "Ray diagrams Physics - Optical Instruments-Astronomical Telescope"
• Physics Made Easy- Ray...
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[@JasleenKaur-kh5cy]

Among all videos related to this topic urs is the most convincing nd understoodable . Thanks alot

[@physics_made_easy]

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[@physics_made_easy]

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[@hasnaingani9356]

I watched many videos on this topic on KZbin...but this is the best

[@physics_made_easy]

Thanks, Hassnain! Appreciate your kind comments. Have a great New Year 2019.

[@hasnaingani9356]

@@physics_made_easy thanks sir..nd wish you the same

[@3royal291]

1) Right hand rule for Generator . Gen- Induced EMF 2) left hand rule for motor Motor - current carried conductor.

[@vijayadivekar6878]

It's nice to understand

[@physics_made_easy]

Thanks, Vijaya. Also please refer Left Hand Rule and the difference from Right Hand Rule. Welcome to subscribe to the channel, and study 250 remaining videos. Physicsmodels: for faster, easier study.

[@ramahero7095]

Thanks ❤️

[@elams1894]

It seems to me that the error here lies within the direction of what is incorrectly called force. Would not the two "poles" be accelerating toward the dielectric plane? In other words, the two "poles" are trying to create a single magnet. Considering the position of the copper, would not the direction of what is incorrectly referred to here as "force" be the opposite of what you have depicted? Not having a go, just curious. Nice video presentation by the way! Thanks

[@physics_made_easy]

Elams, I think the answer would be that in the traditional Fleming's Right Hand Rule, the magnets are fixed. They are not free to move towards each other. The fixed magnets are just a way to create a magnetic field. The Force is applied externally. Like water falling on blades of a turbine, or in an electric car, the Forces during Braking that act opposite to the direction of propelling the wheels. (Check Regenerative Braking videos) The direction of Force is an input, it's determined by us, it's not an outcome of a Generator. Next, Even in a real Generator, the magnets have poles facing each other, and there can be two distinct magnets. Of course, the magnets can't move towards each other, and the gap between the poles is kept small, and is carefully kept constant. Effect of electric field due to induced emf on the magnets:- well, here we have permanent magnets in this video instead of electromagnets. These won't get affected by an external field of the induced emf which is expected to be far weaker than the primary magnetic field. In other words, the created emf can't be strong enough to overcome the parents which created it.

[@physics_made_easy]

Further, the two poles in reality facing each other, help to focus the magnetic field lines.

[@physics_made_easy]

I hope I have answered your question. If the question is different, let me know

[@AbdulRafay12-k1h]

Thankyou so much sir ❤

[@physics_made_easy]

Welcome

[@shahidtariq2684]

Gr8 video easily understood

[@physics_made_easy]

Hi Shahid, thanks. I want to add your name to my website under Appreciations. Please indicate your school and city. From Author, physicsmodels.

[@bruhclay6025]

Excuse me, can you please explain what you mean by: 1) Cutting the magnetic field lines 2) How do you know if it is a *motor* or if it is an *a.c generator*? Thanks. I liked and subscribed.

[@physics_made_easy]

Hello Bruh, 1) cutting the magnetic field lines: The invisible magnetic lines of Force exist always between the North Pole and South Pole of any permanent magnet. If I put my hand in the middle, I am cutting the lines, or "getting in the way" of those lines. If my hand is a conductor, a metallic hand, a current will flow through my hand. But my hand is not a conductor. If you move a copper rod between those invisible lines, a current will surely flow through the copper rod. Now, by moving the rod, you causes some Motion. Motion created electricity. That's nothing but a Generator principle. The Right Hand Rule talks about creating motion of a conducting part to "get in the way" of magnetic field lines, and then creating electricity. The Right Hand Rule gives the directions of current depending on the directions of Motion and direction of magnetic field. The Right Hand rule applies to generators , NOT to Motors. [ Easy way to remember? use some anagram like LNG (Life is not good?) I mean (Lefthand NOT for Generator) 2) Fleming's Left Hand Rule is the opposite and used for Motors. Imagine a Fan. Here we are giving electricity to the thing, and we want motion, rotational Motion. The principle is: when you supply electric current to a conducting part (can be a segment, rod, plate etc) like a metal part, which is already standing "in the way" of magnetic Field Lines, i.e. between some North and South Pole, this part will see a Force acting on it, and this Force will cause it to move. The force is always a linear force. Because the segments are coupled on either side of a centre line, the whole segment rotates and you see a Motor kind of effect. The direction of the Force is given by Fleming's Left Hand Rule. 3) Note: Both these rules give the directions only. They do not tell you how large the current is, how much Force and so on. I hope I could clarify your question. [ You are welcome anytime to login to my website www.physicsmodels.in or physicsmodels.com . I have covered a whole lot of subjects for the entire physics syllabus. ]

[@physics_made_easy]

I must also add for interest that if I am wearing a metallic silver or gold ring on my fingers, and if I wave my palm with some velocity through the magnetic field lines, a current should certainly get generated through my ring.

[@randyskretka8120]

So then if you reverse the direction of the force (the conductor moves down) then I assume the current is also reversed. Is that true?

[@physics_made_easy]

Yes. (and that's because the 3rd thing is kept fixed here -> the direction of magnetic field)

[@studyandfun3829]

Yes ofcourse

[@zitendarkumar2407]

Good

[@physics_made_easy]

Hello Zitendar, pl. mention your school name, city. I can put it on my website also under Appreciations. thanks.

[@chydedelaplace8947]

Great video, thank you!

[@physics_made_easy]

welcome. And if you have some time to see more videos arranged chapter-wise (47 chapters) , please login at my website www.physicsmodels.in . From kaustubhan

[@muneshwartejashwini8805]

Nice

[@physics_made_easy]

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[@rangita6485]

this video is good i understood

[@physics_made_easy]

Hello Sana, please indicate your school name, city, country, and I would like to put under Appreciation tab on my website www.physicsmodels.in thankyou! Have a good day.

[@garenkeshishian8285]

Hi thank you for explanation very easy to understand but im a bit confuse for clockwise and anticlock of the coil , please let me know if you have an easy explanation .

[@physics_made_easy]

Garen, good question. To understand clockwise versus anti-clockwise, first point the fingers for the INPUTS. a) The magnetic field direction is clear, b) For the Force direction- this is upto us, it is an INPUT. If we ourselves put the upward force on the LEFT side of the conducting coil or rectangular segment, then it means the right side of this coil or plate will have a Force direction downwards. Why? Because the coil or plate is free to rotate about an axis passing through its center, this is the hinge for the whole coil. In such case, the rotation will be Clockwise -- when we look from the front side. On the other hand, if we apply a force upwards on the right side of the coil or plate, then the whole piece will rotate Ant-Clockwise. According to how the Force is applied, the induced emf will adjust itself for the direction, that's an OUTPUT of the Right Hand Rule. Therefore, the Generator works as per Right Hand Rule. If water falling from a dam impacts the turbine buckets on the left side of the magnets, this would be a downward force acting on Left Coil, so the Right part of the coil will move upwards, the whole Turbine would rotate anti-clockwise. Of course the water should not fall on both the sides of the turbine buckets at the same time, that would be same as applying the Force downwards on both sides of the conductor plate or coil , and it won't rotate properly.

[@David-ip8bi]

Thanks a lot sir 😍

[@pranchalsharma7956]

Thx

[@physics_made_easy]

Thanks, Pranchal for your good comments. I invite you to see the entire playlist of videos, give likes, subscribe to my channel, and share channel with your friends and relatives in school. I can add your name, school name, city to my website under 'Appreciations" tab, kindly send me the details. Thankyou. Author

[@gunakoushik4494]

nice

[@ankitkumarsahooeee9631]

nice video..

[@nickpierpoint4116]

Would the right hand rule be applicable to the current and force applied to the bars on a squirrel cage rotor? Please let me know!

[@physics_made_easy]

Good question. Answer is "NO". 1) The squirrel Cage design is infact a AC Motor. For any Motor, INPUT is current and OUTPUT should be rotation (of Rotor). 2) The Rotor of the AC Motor is initially at rest and then starts rotating with respect to the rotating Magnetic Field inputted in the Stator Windings. The INPUT to the Motor is magnetic field rotation. The 2nd INPUT becomes current in the bars as a result of the change in Magnetic FLUX felt by the bars. 3) The squirrel cage bars are initially stationary , which means they have highest relative velocity with respect to the high speed Rotating Magnetic field. 4) The change in flux will cause an induced emf in the bars of squirrel cage. The emf causes a current to flow along the bars. The magnitude of emf will be as per Faraday's Law. 5) Now, the current flowing will cause its own magnetic field (circular field lines). 6) This new magnetic field will interact with the main rotating magnetic field and cause Rotation as OUTPUT of the Motor. 7) The direction of rotation of Rotor will be determined by Fleming's Left Hand Rule applied to the conductor segment, which has a current and magnetic field as input. 8) Once the squirrel cage in an Synchronous Motor comes to the same speed as the Rotating Magnetic Field, there won't be any change in flux, hence the current in bars of squirrel cage will be = 0. Hence no induced emf. The bars will stop contributing to rotation of the Rotor. Hope it clarifies a bit.

[@nickpierpoint4116]

thanks, basically my original question is in other words, how can we tell the direction of the current that is inducted on the bars, I understand the workings of an induction motor except for this, essentially can you explain point 5, how do we determine the direction of said induced current and therefore its magnetic field the induced current will produce, thanks.

[@nickpierpoint4116]

because im aware a current is induced on the bars, but a current of which direction, what way on the bars would it flow, what rule determines this?

[@nickpierpoint4116]

Should have specified induction motor not synchronous

[@nickpierpoint4116]

I did some research on lenz's law, I now feel comfortable and my question is mainly answered

[@sahilsahu4027]

When do we use right hand rule and when do we use left hand rule?

[@physics_made_easy]

Hello Sunil, Left Hand Rule - use for DC Motor. And Right Hand Rule - use for Generator. How to remember? You can try something like "LNG" -- meaning can be "Left Not for Generator" Actual way of checking this principle, in a new situation , when magnets position is reversed, current direction is different and so on. We can start from scratch as below :- Imagine the magnetic field (as a result of current flow) on the rectangular segments of the conductor, this magnetic field at every point would be a CIRCULAR magnetic field --this is shown as circular rings, (yellow colour in animation). Then hold any part of the conductor in your right hand with your thumb pointing along the conductor in the direction of INPUT current flow. (This is nothing but Right Hand Thumb Rule. Different from Fleming's Left Hand Rule, please do not mix the two things) Now, If circular magnetic field's direction below conductor segment clashes or is opposite to magnetic field lines direction of North-to-South Pole, then NET magnetic field is weaker below the conductor, and stronger above the conductor. This stronger "person" pushes the weaker person. Hence, this particular part of conductor segment will have to move downwards. Then the other part of conductor segment will have to rotate upwards. Thus, you will see a rotation of entire conductor as long as current is flowing. If current flow stops, everything stops. Hope this clarifies. Thanks.

[@sahilsahu4027]

Physics Models tq sir

[@sulekyasulki2902]

this is flemings left hand rule!!!!! not the right hand

[@physics_made_easy]

Hi Sulekya Sulki, Generators always work as per Fleming's Right Hand Rule. Whereas Motors work always as per Fleming's Left Hand Rule. How to remember that? Use "LNG" meaning "Left Not for Generator".

[@abhishekbm7012]

Is the current taken as conventional current

[@physics_made_easy]

Yes, the current is taken as conventional current direction

[@yasminealzant7671]

Isn't it a left-hand rule ?

[@physics_made_easy]

Hello, Yes, DC Motor applies the Left Hand Rule. pl. see the Left hands put in the Animation, on the conductor. Even if you forget this, you can apply the magnetic field around the conductor, shown as rings, (yellow colour), then use "Right Hand Thumb Rule" to hold the conductor in your right hand. if magentic field direction below conductor clashes with magnetic field direction of North-South Pole, then NET magnetic field is weaker, and then the magnetic field above, on TOP of the conductor would be stronger. that means the stronger person pushes the weaker person. So, this particular conductor segment will move downwards.

[@funnyandcuteviralvideos9053]

i dont understand fleming left hand and right hand rule

[@physics_made_easy]

I can explain it, but writing the whole thing once again here would become Too long. you can login to my website, both Left Hand and Right Hand Rule is explained, then call me if you need personal tuitions.

[@funnyandcuteviralvideos9053]

ok ty

[@physics_made_easy]

Hello Yasmine, Yes, it is a Left Hand Rule. DC Motor works on Left Hand Rule, whereas a Generator works on Right Hand Rule. To see the Left Hand, please refer my video which clearly superimposes the left hands , these are shown near the segments of conductor. The direction of movement of conductor (each segment) will always be shown by thumb pointing direction, when you take care to point forefinger along Magnetic Field (North to South), and middle finger along the Current Flow.

[@bangarubabukoyya7575]

What happen if we reverse the force?

[@physics_made_easy]

If we reverse the direction of the Force, i.e. Force acting vertically downwards, then we simply re-orient the Hand in such a way that thumb points downwards plus the forefinger remains in the same direction pointing from North towards South Pole. With these two new inputs, the Output is the Induced Current direction. The direction of this current will of course get reversed.

[@saumyyaduvanshi2262]

that's not the Fleming's right hand rule

[@dattabhalekar1993]

Well

[@andym415]

Good Tutorial. Read physicsteacher.in/2017/10/12/electromagnetics-left-hand-rule-right-hand-rule/

[@physics_made_easy]

Hello Anupam Majumdar . Thankyou. Pl. indicate also the name of your school, city and I can put it under Appreciations tab on my website- www.physicsmodels.in. You are requested to register on this website.

[@ansh9583]

Well I was here just to see the positions of the fingures

[@ansh9583]

Instead of force it must be motion

[@bhartikulkarni5149]

it is Fleming left hand rule

[@physics_made_easy]

No, it's correct

[@zero_meercat8624]

chump this is the left hand rule!

[@_sky8068]

Why are you calling this right hand rule..

[@physics_made_easy]

Hello Shruti, to answer your question, I have added a very detailed explanation in the text below the video. Please go through it and let me know if it makes sense, and whether you are clear about the important difference between Fleming's Right Hand Rule and Fleming's Left Hand Rule. I wait for your reply. Author (kaustubhan)

[@shakthishakthi6423]

Good