A square loop of wire with a small resistance is moved with constant speed from

Question

A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the left. The self inductance of the loop is negligible.

True or False  Upon entering the field, a counterclockwise current flows in the loop.
True or False  When leaving the field the coil experiences a magnetic force to the right.
True or False  When entering the field the coil experiences a magnetic force to the right.
True or False  While the loop is entirely in the field, the emf in the loop is zero.

The answer is not any of the following:

- F, T, T, F
- T, T, T, F
- T, F, F, T
- T, T, F, T
- T, F, T, T
- F, F, T, T
- F, T, T, T

Explanation / Answer

upon entering into the field magnetic flux increases so that the induced emf or induced current such that it opposes the increase in flux so it generates the magnetic field in oposite to exisitng hence the current is in counter clock wise (T)

when leaving the field flux reduces so induced emf have to increase the flux hence it moves to the right (T)

when entering the field flux increases so induced emf have to increase the flux hence it moves to the left(F)

no variation in magnetic flux when the coil competely in field so emf in loop is zero (T)

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