Question

Under which of these conditions, the torque acting on the current-carrying loop is minimum?

(a) θ = 90^o

(b) θ = 0^o

(c) θ = 180^o

(d) θ = 360^o

I got this question at a job interview.

My doubt stems from Torque on Current Loop & Magnetic Dipole topic in division Moving Charges and Magnetism of Physics – Class 12

Answer 1

Right option is (a) θ = 90^o

For explanation: When θ = 90^o ➔ τ = NIBA.

The torque is maximum when the plane of the loop is parallel to the magnetic field. So the angle θ has to be 90^o.