The length of a solenoid is 0.4 m and the number turns in it is 500. A current of 3 amp, is flowing in it. In a small coil of radius 0.01 m and number of turns 10, a current of 0.4 amp. is flowing. The torque necessary to keep the axis of this coil perpendicular to the axis of solenoid will be
A. 5.92 × 10–6 N-m
B. 5.92 × 10–4 N-m
C. 5.92 × 10–6 dyne-cm
D. 5.92 × 10–4 dyne-cm
Answer:A
The length of a solenoid is 0.4 m and the number turns in it is 500. A current of 3 amp, is flowing in it. In a small coil of radius 0.01 m and number of turns 10, a current of 0.4 amp. is flowing. The torque necessary to keep the axis of this coil perpendicular to the axis of solenoid will be
A. 5.92 × 10–6 N-m B. 5.92 × 10–4 N-m C. 5.92 × 10–6 dyne-cm D. 5.92 × 10–4 dyne-cm