Question

When a coil of area $\overline{A}$ carrying current $i$ is suspended in a magnetic field of induction $\overline{B}$ , then the torque on the coil is

• A. $(\overline{A}\times \overline{B})$
• B. $\hat{i}(\overline{A}-\overline{B})$
• C. $\hat{i}(\overline{A}\times \overline{B})$
• D. $\overline{A}(\hat{i}\times \overline{B})$

Answer 1

Answer: (C)

$\hat{i}(\overline{A}\times \overline{B})$

Torque on magnetic dipole, $\hat{i}(A\times B)$
where $i$ is current
$A$ is area vector normal to the area surface
$B$ is magnetic field