Two bar magnets are in line. One has a m...

Two bar magnets are in line. One has a magnetic length of `0.08m` and pole strength of 5Am and the other has a magnetic length of `0.04m` and pole strength of 4Am, their midpoints being 0.16m apart. Find the work done in turning one of these magnets over end for end.

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The correct Answer is:

`7.4 xx 10^(-6)J`

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