NCERT Class XII Chapter
Magnetism and Matter
Questions With Solutions
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Question : 8
Total: 25
A closely wound solenoid of 2000 turns and area of cross-section 1.6 × 10 – 4 m 2
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10–2 T is set up at an angle of 30° with the axis of the solenoid
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10–2 T is set up at an angle of 30° with the axis of the solenoid
Solution:
Soln. (a) Magnetic moment associated with solenoid
M = NIA = 2000 × 4 × 1.6 ×10 – 4 m 2
(b) Force on the solenoid will be zero in uniform magnetic field.
Torque τ = MB sinθ
= 1.28 × 7.5 ×10 – 2 10 – 2
The torque tends to align the solenoid in the direction of magnetic field.
M = NIA = 2000 × 4 × 1.6 ×
(b) Force on the solenoid will be zero in uniform magnetic field.
Torque τ = MB sinθ
= 1.28 × 7.5 ×
The torque tends to align the solenoid in the direction of magnetic field.
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