Q.

A magnetic pole of strength 1Am is moved 10 times around a long straight wire carrying a steady current of πA. The work done is (assume π210)
 

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a

400 μJ

b

4 mJ

c

0 J 

d

40 μ

answer is B.

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Detailed Solution

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work done to make one unit north pole once around the conduction is μ0i joules ( Ampere's circuital law )

 for ten rotations 10μ0i joules

W=10×4π×10-7×π=4π2×10-6= 40μJ    π210

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A magnetic pole of strength 1Am is moved 10 times around a long straight wire carrying a steady current of πA. The work done is (assume π2≈10)