Lenz's Law, Right Hand Rule, Induced Current, Electromagnetic Induction - Physics

[@TheOrganicChemistryTutor]

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[@someone3706]

6:14, I understand that induced flux density supports to keep the equilibrium so it should be inside the coil but why outside of the coil ( 6:17 )should be out of the page because the external induced magnetic flux density is into the page

[@jamesmacrae7730]

No because if the magnetic field is into the page within the open surface we are considering ( the area bound by the loop), then it should be outwards on the outside because magnetic fields are circular around current-carrying wires.

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[@themansans1929]

it took me several replays to finally get this. ON the slim chance you do anything else on this, I would put the equation for Magnetic field as well as the flux that way we can see WHY the flux is either decreasing or increasing. Also, is there a rule for the directions for Bex and Bin to keep flux equal? as in, if flux decreasing and Bex is into page, then Bin is into page as well

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Thank you. You are so detailed. I have confused about how to determine direction of induced current and by this video i got it. Thank you.

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Ty soo much ..U helped me a lot.. I think in the last one the direction should have been anticlockwise.

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[@simransingh5496]

I'm confused about the example with the straight wire. He says at 8:48 that if the flux is decreasing then the system will try to oppose that and increase the flux to bring it back, but the induced current is found to be out of the page to "support a decrease in flux". Could someone explain that? Why would we support a decrease in this scenario if the system want's to increase it so it's back to equillibrium?

[@MrYahya0101]

At 10:39 shouldn't the current be pointing in the clockwise direction since induced magnetic field will have to be out of page below the loop and into page inside the loop (contrary to what is drawn)?

[@midtzara]

For the last problem where I is decreasing shouldn't the induced current move CW to oppose? Original B is decreasing out of the page. which produces an increasing field into the page in the loop and I moving CCW. According to Lenz law there must be.an I opposing the new field so current has to move CW and B must be the same direction as original B out of the page.

[@nigelwilliams7920]

My thought too. He gets that backwards Should be crosses inside w clockwise current methinks.

[@xHakase]

When the current is decreasing, the magnetic field is also decreasing - leading to a decrease in magnetic flux through the loop from behind the page. As a result, Lenz's law wishes to oppose this decrease in flux: the current in the loop attempts to compensate for the decreasing flux with current in the counterclockwise direction. By the right-hand rule, a counterclockwise current in the loop will try to restore the initial magnetic flux coming into the loop from behind the page. The current would move clockwise in the case that current is increasing in the wire. By increasing current in the wire, there is more flux through the loop from behind the page. In this situation, Lenz's law wants to oppose this increase in flux: the current in the loop is now clockwise so that the magnetic flux through the loop is now into the page - which is the opposite outcome of increasing flux from behind the page.

[@pootispencerhere.]

At 9:42 I dont understand how you got that the induced magnetic field in the loop goes into the page at the side nearest the wire. My intuition tells me that the magnetic field nearest to the straight wire should support the straight wire's field by going out of the page closest to the wire, which is external to the wire. Is it just that the center of the loop is what needs to match the external field lines? If someone could explain that would be awesome sauce.

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[@NK-iy6if]

God bless you! Thank you for your explanation it is very helpful, just a simple question for the last example why doesn’t the magnetic field created by the induced current travel in the same direction as that other magnetic field as a result supporting the magnetic field and opposing the change ( why is the magnetic field from the induced current traveling inside next to the wire rather than outside ( same direction as the other magnetic field)?

[@uriellara6721]

Doesn't the change in the magnetic flux cause a induced electric field? And wouldn't the induced electric field cause the work to be done on the electrons that create a voltage and current?

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[@EnergySeeker]

a question please , is there is a way to use the current but cancel the opposing flux so no power loss or drag on the prime mover like if we put a GAP on the core which have the coil ?

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[@ren5124]

3:40 What is the reason behind making the inside of the coil into the page? How does that oppose the existing uniform magnetic field?

[@jamesmacrae7730]

As the coil is moving into the uniform magnetic field, we can agree that there will be an increase in magnetic flux through the coil, i.e. an increase in delta phi. So the induced magnetic field must oppose this change by decreasing the magnetic flux through the coil, i.e. decreasing delta phi. This is why the induced magnetic field is in the opposite direction, into the page because the vector sum of both the magnetic fields will be less than before.

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[@diftq8191]

im so confused, like for the last example, the magnetic field is going clockwise and the decreasing current is pointed to the right. Since the flux is decreasing, you want to have the induced current go in the same direction as the original current, so the induced current should also point to the right and the induced magnetic field should be clockwise as well right??

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[@kristofferbrink2689]

But what about the magnetic field, outside the coil. If we take the first example, the magnetic field created by the induced emf, would go against the increase in flux inside the coil, but wouldn’t it go with the magnetic field outside the wire. Wouldn’t it increase the field outside the wire, and induce even more current. I think the magnetic field/flux, only affects the inside of the coil, but why is that? Is there a law for that?

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Thank you once again.

[@NadhirBouzidi]

i have a problem with calculating the induced emf in a conductor ,usually when the magnetic field is not uniforme every section has it own flux so it would have a different induced emf . I did have an idea to solve it i want to know if it is true . i take every section as a conductor with a thickness dh than calculate it resistance than i use ohm's law to calculate the induced courant that flow in this section using the emf and the resistance of that section than i do sum the induced courant in every section so i get the total induced courant than i multiply it by the resistance of the conductor so i get the emf

[@kurtschlarb9762]

I still don't get it.

[@Vexis.gaming]

Always the magnetic field will be opposite to the induced emf to maintain its equillibrium

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Thanks!

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[@lingardinho2956]

why does the flux decrease when you decrease the current? Won't B increase, and consequently the flux?

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0.45 seconds and i swear it explained my misunderstanding :)

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[@vietle7340]

8:40 why the flux is decreasing as the current decreasing?

[@zikrizakaria3526]

what happened to the direction of current when the wire is fully in the magnetic field?

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[@EthanQuinones-q6o]

what happens if the magnetic field is constant though or if the current is constant?

[@INB-z6e]

Why does putting a coil into a magnetic field increase B? (sorry if this is a dumb question)

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This is the first OG video that actually confused me even more. Sorry mate.

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i dont believe the magnetic field around a wire conductor is oriented circumferentially. where is the north and south in such case? rather, the lines of magnetic force travel from the point of polarization to the furthest point of the conductor.

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