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A bar magnet of magnetic moment 3.0Am^2 ...

A bar magnet of magnetic moment `3.0Am^2` is placed in a uniform magnetic field of `2xx10^(-5)T` if each pole of the magnet experiences a force of `6xx10^(-4)` N the length of the magnet is

A

0.5m

B

0.3m

C

0.2m

D

0.1m

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • When a magnet is placed in a uniform magnetic field , it experiences

    A
    a force but no torque
    B
    a torque but no force
    C
    a force and also a torque
    D
    neither a force nor a torque

  • The torque acting on a bar magnet of magnetic moment M in a uniform magnetic field B will be

    A
    `MBsintheta`
    B
    `MB//sintheta`
    C
    `MBcostheta`
    D
    `MB//costheta`

  • A short bar magnet of magnetic moment 0.4JT^(-1) is placed in a uniform magnetic field of 0.16T the magnet is in stable equilibrium when the potential energy is

    A
    (-0.064)J
    B
    zero
    C
    (-0.082)J
    D
    0.064 J

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