Question

A circular loop of area $1\,cm^{2}$ , carrying a current of $10\,A$ is placed in a magnetic field of $0.1\,T$ perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is

• A. $0$
• B. $10^{-4}N\,m$
• C. $10^{-2}N\,m$
• D. $1\, N\,m$

Answer 1

Answer: (A)

$0$

Answer 2

Circular loop is placed perpendicular to the magnetic field. Therefore, angle between area vector and magnetic field is zero.
$\therefore \tau=I A B \sin 0^{\circ}=0$