A rectangular loop of wire, supporting a mass m, hangs with one e… - Vidyadip

MCQ

A rectangular loop of wire, supporting a mass $m$, hangs with one end in a uniform magnetic field $\vec B$ pointing into the plane of the paper. $A$ clockwise current is set up such that $i> mg/Ba,$ where $a$ is the width of the loop. Then

A
The weight decends due to a vertical force caused by the magnetic field
B
The weight moves towards rightward
✓
The weight rises due to a vertical force caused by the magnetic field
D
None of these

✓

Answer

Correct option: C.

The weight rises due to a vertical force caused by the magnetic field

c
$\vec F = I\overrightarrow {dl} \times \overrightarrow B $

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