Physics 44 Magnetic Field Generated (1 of 28) By Moving Charges

[@MichelvanBiezen]

Caroline, This is the playlist for magnetic fields caused by charges and currents. PHYSICS 44 MAGNETIC FIELD SOURCES There are a couple of videos on magnetic fields caused by a long straight wire and a wire segment.

[@carolinepena6225]

Dear Professor van Biezen, Your physics videos have been a miracle to me since I started college! They have been the reason I've passed my midterms and my physics classes. I was wondering if you could do a video on magnetic field due to a current on a long straight wire? It will be on my final and you do not have any videos on it. Thank you in advance!

[@chisomodimmegwa3479]

I know it's too late but he have already done a video on that

[@saminzawadovik7681]

My left ear will surely pass the test

[@e.jimenez7562]

I thought my headphones were broken !!!!

[@eneserten6018]

Professor Michel can Biezen your videos are really understandably and helpfully thank u 2 the videos & sharing your knowledge.

[@cueva_mc]

try to change the sound to stereo, thanks for the vids

[@phillipdoan9919]

I'd like that idea too.

[@andrewrobinson518]

look under accessibility on your computer, you should have the option to change stereo sound to mono so it fills both channels. just remember to undo it afterwards

[@lwandilekhwezi8778]

@@andrewrobinson518 you're an ear savor

[@RiaziMohandesi]

Professor Michel is very smart, he dicovers his mistake very soon 😀😀

[@zakirhussain-js9ku]

I think subatomic particles are made up of electric charge, magnetic charge & mass. As an example an Electron has 3 shells. Its outer shell is electric charge, middle shell is magnetic charge & inner shell is mass. Center of electron is empty.When at rest these 3 components are spread over 3D space. Outer electric shell completely covers & shields the inner magnetic charge(it is just like neutron which has no electric field but shows up its hidden electric charge on decay). As a result stationary electron does not show any magnetic properties. As soon as electron starts moving its 3 components start shifting to one of 3 spatial dimensions at right angle to each other. Mass occupied the axis in the direction of motion while the other 2 take up one of remaining 2 axis. At light speed entire electric, magnetic charge & mass get shifted to their respective spatial dimension (as in Photon). Shifting of electric field from 3D to 1D due to motion of electron exposes hidden magnetic field of electron which is the reason why only moving electron produces magnetic field. Faster the electron moves more of its electric field shifts to 1D, more of its hidden magnetic field gets exposed & stronger the magnetic field gets.

[@MichelvanBiezen]

We do not have any insight as to the structure of an electron since the diameter is of the order of 1 x 10^-18 m

[@zakirhussain-js9ku]

​@@MichelvanBiezenI think size should not intimidate us into stopping our investigation. Even smaller particles exist. Smallest could be the particles which make up electric, magnetic & gravitational fields.

[@tylerlivingston7445]

The question written on the board says the position 20cm above the alpha particle, but the diagram you drew only says 2cm.

[@MichelvanBiezen]

+Tyler Livingston There is a dot there (2.0 cm) but it is hard see.

[@tylerlivingston7445]

Michel van Biezen oh I didn't even catch that.

[@caroe.3237]

how to you know the unit vector of r is 1? where does it say that

[@MichelvanBiezen]

Unit vectors by definition always have a magnitude of "1". A vector divided by its own magnitude thus becomes a unit vector.

[@hitmanLis]

In my university they teach magnetic field represented by letter "H" and "B" is the magnetic field density. Which is right?

[@MichelvanBiezen]

+Glad to Be Normal H = B / mu (where mu is the permeability of the material) Thus you can calculate everything using either letter. When you use H, it often eliminates mu from the equation.

[@hitmanLis]

+Michel van Biezen My electromagnetism instructor said that in a free space the field is called "H" and when it goes trough some type of material/medium it becomes "B". Is that right?

[@PTNLemay]

If the particle is negative instead of positive, the rule gets flipped, correct? So it would be like using the left hand for the application of the rule.

[@MichelvanBiezen]

Yes, we use the left hand instead of the right hand

[@PTNLemay]

@@MichelvanBiezen Thanks!

[@loulintereur8155]

If I were moving along with the alpha particle at the same velocity, would I still observe a magnetic field? I would think that I would only observe an electric field since the velocity of the charge would be zero with respect to my point of reference. How it it possible that the the alpha particle would generate a magnetic field in once case and not the other?

[@MichelvanBiezen]

+Lou Lintereur A moving alpha particle, or any charged particle, that moves through space will produce a magnetic field. Why would you not observe that field by moving at the same speed as the particle? The field will be there irregardless of your actions.

[@loulintereur8155]

What does it mean to be moving through space? There is no such thing a fixed space, only inertial (non-accelerating) reference frames. If both the observer and the particle were "moving" at the same velocity, they would both be fixed in the same inertial frame. Therefore, the observer would not measure a magnetic field from the particle, only an electric field. However, another observer in a different inertial frame that was moving with respect to the particle's frame would measure both an electric field and a magnetic field as it passed by the apparently moving particle. I do not understand why that is.

[@MichelvanBiezen]

+Lou Lintereur You are making statements such as: "Therefore, the observer would not measure a magnetic field from the particle". You need to show mathematically why that is true, not just "think" it is true. In physics we often go down the wrong logic path, and the only way to find the correct solution is to anchor ourselves to theories and laws that we are sure of. So take it one step at a time and make sure each statement is true and correct. The statement that starts with "therefore" is not correct.

[@loulintereur8155]

Say for example there was an alpha particle resting on a table in front of me. Would I measure a magnetic field from it? There should be no magnetic field according to the Biot-Savart law because the particle is "at rest" on the table. However, both the table and I are traveling through space at great speed with respect to the sun as we rotate on the earth and revolve in our the orbit. The sun itself is moving with respect to the center of our galaxy, and our galaxy is moving with respect to other galaxies, and so forth. Why would a magnetic field not be created due to this motion? Furthermore, what is the ultimate frame of reference by which we would determine the particle's absolute velocity through space? I am sincerely confused by this.

[@nabeelidris2734]

how do you get the formula?

[@MichelvanBiezen]

+nabeel idris This formula is derived from the Biot and Savart law.

[@nabeelidris2734]

+Michel van Biezen thank you so much sir,

[@portiaawuah4655]

i'm very confused as to where the formula for magnetic field came from. it seems each scenario has a unique formula. How do i get all these formulas off head

[@MichelvanBiezen]

The magnetic field of any geometric situation is found by using the Biot-Savart law. After you find the magnetic field caused by a few different geometric shapes such as that cause by a current in a straight wire, a circular wire, a solenoid, etc. you just memorize them.

[@portiaawuah4655]

Michel van Biezen thank you

[@jacobvandijk6525]

But what is a TESLA exactly? The unit is not derived in the video. It is derived from the magnetic part of the Lorentz-force: F = q . (v x B). Looking at the units: the B-unit = (N/C) . (s/m). Let's multiply this by 1 = m/m. We then get: the B-unit = N.m.C/(s/m^2). We know N.m = Joule, C/s = Amp and 1/m^2 = 1/area. So, 1 Tesla = 1 Joule of energy per square meter, per Amp!!! Remember, the magnetic field is the result of an electric current, measured in Amps! The surrounding magnetic field holds an amount of energy per square meter (area of some framework put in the magnetic field)! Now you know what a Tesla is. At last! :-)

[@MichelvanBiezen]

That is described in this video: Save Cancel Physics - Mechanics: Ch. 0.5: Standard Units (21 of 41) Magnetic Field

[@jacobvandijk6525]

@@MichelvanBiezen That's a bit of a problem with all these videos, Michel. The same subjects are popping up in different places. Where to begin?????

[@williammahler1615]

I don't understand why the 4pi is in the denominator.

[@MichelvanBiezen]

William, All equations in physics that deal with laws of nature require a constant of proportionality. With magnetism, that is muo = 4 * pi * 10^(-7).

[@timmyturner5831]

who is watching from Türkiye?

[@jeodemp]

Finallere hazırlık :)

[@ahmettahiri1713]

ya size yardimci oldu mu bu videolar ?

[@timmyturner5831]

Kesinlikle cogunda profun soru tarzina uymasada konuyu anlamana yardimci oluyor

[@eneserten6018]

iyi ya prof okuldaki egolu havali hicbir bok bilmeyen anlamayan fen edebiyatcilardan fizikcilerden iyi

[@eneserten6018]

ama takdir edersinizki belli bir seviyede ingilizce gerek

[@garikmegerdich9317]

0.2 was right in the beginning

[@laylajameel1836]

2019

[@hazimalkurishy9012]

who is Iraqi or from middle east plz like