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A wire length 6.28m is bent into a circu...

A wire length `6.28m` is bent into a circular coil of 2 turns. If a current of `0.5A` exists in the coil, the magnetic moment of the coil is, in `Am^(2) :`

A

`pi/4`

B

`1/4`

C

`pi`

D

`4pi`

Text Solution

Verified by Experts

The correct Answer is:
A
`M = NI pi r^2 , l = (2pir) N`
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Knowledge Check

  • A wire of length 6.28 m is bent into a circular coil of 2 turns. If a current of 0.5 A exists in the coil, the magnetic moment of the coil is, in A-m^2

    A
    `pi/4`
    B
    `1/4`
    C
    `pi`
    D
    `4pi`

  • A circular coil of diameter 7cm has 24 turns of wire carrying current of 0.75A . The magnetic moment of the coil is

    A
    `6.9xx10^(-2) amp -m^(2)`
    B
    `2.3xx10^(-2)amp-m^(2)`
    C
    `10^(-2)amp-m^(2)`
    D
    `10^(-3)amp-m^(2)`

  • A circular coil of diameter 7 cm has 24 turns of wire, carrying current of 0.75 A. The magnetic moment of the coil is

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    `6.9xx10^(-2)A-m^(2)`
    B
    `2.3xx10^(-2)A-m^(2)`
    C
    `10^(-2)A-m^(2)`
    D
    `10^(-3)A-m^(2)`

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