A square loop of wire with a small resistance is moved with constant speed from
ID: 2278558 • Letter: A
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 right. The self inductance of the loop is negligible.
TRUE OR FALSE:
1.Upon entering the field, a counterclockwise current flows in the loop.
2. When entering the field the coil experiences a magnetic force to the left.
3. When leaving the field the coil experiences a magnetic force to the right.
4. While the loop is entirely in the field, the emf in the loop is zero.
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 right. The self inductance of the loop is negligible.Explanation / Answer
1 False .
the direction of curent must produce a field to oppose the present field. the current should be anti clock wise so that a cross type field is produced
2 True
Lenz law . the force generated oppses the cause . hence the coil experiences a force towards left which tries it to stop from entering,
3 True
Sane explanation as q no 2
4 true
no change in magnetic field ,hence no emf generated
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