A magnetized needle of the magnetic moment 20 JT^-1 is placed at 60^o with the direction of the uniform magnetic field of magnitude 9 T. What is the torque acting on the needle?(a) 225 J(b) 625 J(c) 155.8 J(d) 318 JI had been asked this question in examination.This question is from Bar Magnet in portion Magnetism and Matter of Physics – Class 12

A magnetized needle of the magnetic moment 20 JT^-1 is placed at 60^o

1.	A magnetized needle of the magnetic moment 20 JT^-1 is placed at 60^o with the direction of the uniform magnetic field of magnitude 9 T. What is the torque acting on the needle?(a) 225 J(b) 625 J(c) 155.8 J(d) 318 JI had been asked this question in examination.This question is from Bar Magnet in portion Magnetism and Matter of Physics – Class 12
Answer» Correct choice is (c) 155.8 J Easiest EXPLANATION: Torque, τ = mBsin (θ). Given: m = 20 J/T; B =9 T; θ = 60^o τ = 20 JT^-1 × 9 T × sin(60^o) τ = 155.8J.

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