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NEET-XII-Physics

05: Magnetism And Matter

 page 3
Qstn# 8-a Prvs-QstnNext-Qstn
  • #8-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?
    Ans : The magnetic moment along the axis of the solenoid is calculated as:

    M = nAI

    = 2000 × 1.6 × 10-4 × 4

    = 1.28 Am2
    (b) Magnetic field, B = 7.5 × 10-2 T

    Angle between the magnetic field and the axis of the solenoid, θ = 30°

    Torque,



    Since the magnetic field is uniform, the force on the solenoid is zero. The torque on the solenoid is
  • #8-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?
    Ans : Magnetic field, B = 7.5 × 10-2 T

    Angle between the magnetic field and the axis of the solenoid, θ = 30°

    Torque,



    Since the magnetic field is uniform, the force on the solenoid is zero. The torque on the solenoid is