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A closely wound solenoid of 2000 turns and area of cross-section 1.5 × 10 – 4 m 2 carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field 5 × 10 – 2 tesla making an angle of 30° with the axis of the solenoid. The torque on the solenoid will be

1. 3 × 10 – 3 N m
2. 1.5 × 10 – 3 N m
3. 1.5 × 10 – 2 N m
4. 3 × 10 – 2 N m

Correct answer: 1.5 × 10 – 2 N m

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