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A north pole of strengt pi A m, is moved...

A north pole of strengt` pi A m`, is moved around a circle of radius `10cm` which lies around a long straight conductor carrying a current of `10A`. The work doen is nearly

A

`4mu J`

B

`40 mu J`

C

`400 mu J`

D

`0.4 mu J`

Text Solution

Verified by Experts

The correct Answer is:
B
`w = mu_0 mn i`
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Knowledge Check

  • The strength of the magnetic field around a long straight wire, carrying current, is

    A
    inversely proportional to the distance from the wire
    B
    inversely proportional to the square of the distance from the wire
    C
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    D
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    `5 xx 10^(-5)` N/Am
    C
    `5 xx 10^(-5)` gauss
    D
    `5 xx 10^(-6)` tesla

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