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A magnetised wire of magnetic moment 'M'...

A magnetised wire of magnetic moment `'M'` and length `'l'` is bent in the form of a semicircle of radius `'r'`. The new magnetic moment is

A

`(2M)/(pi)`

B

2M

C

`(M)/(pi)`

D

zero

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A magnet of magnetic moment M and length 2l is bent at its mid-point such that the angle of bending is 60^(0) . The new magnetic moment is.

    A
    `M`
    B
    `(M)/(2)`
    C
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    D
    `(M)/(sqrt2)`

  • A magnetic wire of dipole moment 4pi Am^(2) is bent in the form of semicircle. The new magnetic moment is

    A
    `4 pi Am^(2)`
    B
    `8pi Am^(2)`
    C
    `8 Am^(2)`
    D
    None of these

  • A straight steel wire of length l has a magnetic moment M. When it is bent in the form of a semi - circle its magnetic moment will be

    A
    M
    B
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    C
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    D
    `Mpi`

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