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A small flat coil carrying current has m...

A small flat coil carrying current has magnetic moment `mu`. It is placed in an external magnetic field `B`. The maximum potential energy of the system can be

A

`muB//2`

B

`muB`

C

`muB In 2`

D

`2muB`

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The correct Answer is:
A
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Knowledge Check

  • A flat circular coil, carrying a current, has a magnetic moment mu

    A
    `mu` has only magnitude, it does not have direction
    B
    The direction of `mu` is along the normal to the plane of the coil
    C
    The direction of `mu` depends on the direction of the current flow
    D
    The direction of `mu` does not change if the current in the coil is reversed

  • A flat coil carrying a current has a magnetic moment vecmu . It is placed in a magnetic field vecB . The torque on the coil is vec(tau)

    A
    `vec(tau)=vecmuxxvecB`
    B
    `vec(tau)xxvecBxxvecmu`
    C
    `|vec(tau)|=vecmu.vecB`
    D
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  • A flat coil carrying a current has a magnetic moment mu . It is placed in a magnetic field B such that mu is anti-parallel to B . The coil is

    A
    not in equilibrium
    B
    in stable equilibrium
    C
    in unstable equilibrium
    D
    in natural equilibrium

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