A thin uniform rod of negligible mass and length l is attached to the floor by a hinge P. The other end is connected to a spring of force constant k. Rod is in a uniform magnetic field B pointing inwards the plane of paper. A current I is passed through the rod. Find the torque acting on the rod due to magnetic force when the rod makes an angle 53 0 as shown in
A
II 2 B
B
B
C
D
II 2 B
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic force acting at the center of the rod is 
direction of this force is perpendicular to the rod.
Therefore magnetic moment of this force about the hinge 
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