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The magnetic potential energy, when a ma...

The magnetic potential energy, when a magnetic bar of magnetic moment `vec m` is placed perpendicular to the magnetic field `vec B` is

A

`-frac{mB}{2}`

B

Zero

C

`-mB`

D

`mB`

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • The torque acting on a magnet of magnetic moment 'M' placed in a uniform magnetic field B is

    A
    perpendicular to `vecM," parallel to "vec B`
    B
    parallel to `vecM," perpendicular to " vecB`
    C
    perpendicular to both `vecM and vec B`
    D
    parallel to both `vecM and vecB`.

  • The potential enargy of bar magnet of magnetic moment 8 Am ^(2) placed in a uniform magnetic field of 2 T at an angle of 120^(@) is equal to

    A
    `-16J`
    B
    `16 J`
    C
    `-8J`
    D
    `8 J`

  • How many neutral points will be obtained when a bar magnet is kept with magnetic moment parallel to earth's magnetic field ?

    A
    One
    B
    Two
    C
    Four
    D
    Infinite

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