# T/F Loop of a Wire Entering and exiting a field

1. The problem statement, all variables and given/known data
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

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True/False
1) Upon entering the field, a clockwise current flows in the loop.
2) Upon leaving the field, a counterclockwise current flows in the loop.
3) When entering the field the coil experiences a magnetic force to the right.
4) When leaving the field the coil experiences a magnetic force to the left.

2. Relevant equations
Right Hand Rule

Lenz Law- induced emf resulting from a changing magnetic flux has a direction that leads to an induced current whose direction is such that the induced magnetic field opposes the original flux change
Steps:
A) What is the direction of the field?
B) Is the flux getting bigger or weaker?
C) Induced Field: bolster or reduce?
D) What current is needed to get the induced field?

3. The attempt at a solution

I thought that
A)False –
1) direction of field: into the board
2) Flux is getting bigger
3) Induced field needs to reduce
4) Clockwise current is needed

B)True –
1) direction of field: into the board
2) Flux is getting smaller
3) Induced field needs to be bolstered
4) Counter Clockwise current is needed

C)False –
B-direction of field: into the board
V- velocity: left
F- magnetic force: down

D)False –
B- direction of field: into the board
V- velocity: left
F- magnetic force: down

I am not sure which parts, if any, are right and wrong. I am also not sure if I am using the right "way" (Lenz Law, right hand rule) to solve the problem.

Any help/explanation would be greatly appreciated!

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