A uniform magnetic field B of 0.3 , T is along the positive Z- di… - Vidyadip

MCQ

A uniform magnetic field $B$ of $0.3\, T$ is along the positive $Z-$ direction . A rectangular loop $(abcd)$ of sides $10\, cm\times5\, cm$ carries a current $I$ of $12\, A$. Out of the following different orientations which one corresponds to stable equilibrium ?

A
B
✓
D

✓

Answer

Correct option: C.

c
Magnetic moment of current carrying rectangular loop of area $\mathrm{A}$ is given by $\mathrm{M}=$ $N I A$

magnetic moment of current carrying coil is a vector and its direction is given by right hand thumbrule, for rectangular loop, $\overrightarrow{B}$ at centre due to current in loop and $\overrightarrow{\mathrm{M}}$ are always parallel.

Hence, $(c)$ corresponds to stable equilibrium.

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