CODE 680922 - 2017 Fall, PHYS 212 (cook) Test8 f17-Y1 Name A square loop of wire

Question

CODE 680922 - 2017 Fall, PHYS 212 (cook) Test8 f17-Y1 Name 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. at equ field halfw in the pos Must the b Upon entering the field, a clockwise current flows in the 1. AO True B False Ar p While the loop is entirely in the field, the emf in the loop is zero 2. AO True BO False b When entering the field the coil experiences a magnetic force to the right. 3. AO True BO False b When leaving the field the coil experiences a magnetic force to the left. 4.AO True BO False 8. AC BC 6 pt Consider the three situations 1, 2, and 3 of charged tie Geld as indicated in the figure

Explanation / Answer

Here magnetic field B is into the page and V is in left direction

From the equation of force F = I *(L x B)

If L is moved in the direction of B, then Thumb indicates the direction of force.

1. Upon entering field, current flows clockwise. FALSE. Current goes in Down Ward direction

2. When the loop is completely in the field, emf is e = Ldi/dt so it is zero TRUE

3. When entering field coil experiences force tor right is FALSE if it is left TRUE

4. When leaving field coil experiences force to the left. TRUE

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