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The work done in maving a unit n- pole r...

The work done in maving a unit `n-` pole round a conductor carrying current in a circle of radius `10cm` is `w`. The work done in moving it in a circle of radius `20cm` is

A

w

B

2w

C

w/2

D

4w

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The work done in blowing a soap bubble of radius 0.02 cm is ,

    A
    `12.56 xx10^(-9)`J
    B
    `25.12xx10^(-9)`J
    C
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    D
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    750 J
    B
    1570 J
    C
    `1.57 xx10^(2)`erg
    D
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  • Find the circumference of a circle of radius 10.5 cm.

    A
    68 cm
    B
    66 cm
    C
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    D
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