NEET 2010 Physics question
A closely wound solenoid of 2000 turns and area of cross-section carries a current of . It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field tesla making an angle of with the axis of the solenoid. The torque on the solenoid will be
Answer: (3)
Solution
Magnetic moment of the solenoid: . Torque: \sin10^{-2}\sin$30° =
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