# Direction of induced current in the loop

• Jahnavi
In summary, the conversation discusses the concept of a moving electron as a current element and its effects on magnetic fields and induced currents. The correct treatment of a moving charge and its fields is also mentioned. The reasoning for answering a multiple choice question in an introductory physics context is deemed sufficient.
Jahnavi

## The Attempt at a Solution

I am having a little doubt as to how to think of the moving electron as a current .

I am considering the moving electron as a very tiny (infinitesimal ) current element . It is as if when the electron is at A , there is a very tiny current element at A . As electron moves from A to B , this small current element also shifts it's position continuously from A to B .

From Biot - Savart law , we see that the magnetic field depends on the distance . As the distance first decreases and then increases, the magnitude of magnetic field through the loop first increases , then decreases .The direction of EMF and induced current reverses direction .Option 4) is correct .

Is my reasoning correct ? More importantly is it correct to treat moving electron as a tiny current element which continuously changes its position ?

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• electron-induced current.png
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Jahnavi said:
Is my reasoning correct ? More importantly is it correct to treat moving electron as a tiny current element which continuously changes its position ?
See here for the correct treatment of a moving charge and the fields it generates.
https://en.wikipedia.org/wiki/Liénard–Wiechert_potential
For the purposes of answering the multiple choice question in an introductory physics context, your reasoning is good enough.

Jahnavi
Thanks !

## 1. What is the direction of induced current in a loop?

The direction of induced current in a loop is determined by Lenz's Law, which states that the induced current will flow in a direction that opposes the change in magnetic flux through the loop.

## 2. How is the direction of induced current determined?

The direction of induced current is determined by the right-hand rule, which states that if you point your thumb in the direction of the changing magnetic flux, the fingers of your curled hand will point in the direction of the induced current.

## 3. Does the direction of the induced current change?

Yes, the direction of induced current can change if the magnetic field or the orientation of the loop changes.

## 4. What factors affect the direction of induced current?

The direction of induced current is affected by the strength and direction of the magnetic field, the area of the loop, and the speed at which the magnetic field changes.

## 5. Can the direction of induced current be reversed?

Yes, the direction of induced current can be reversed by changing the direction of the magnetic field or by changing the orientation of the loop with respect to the magnetic field.

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