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Question

Four magnets of equal length but magnetic moments M, 2M, 3M and 4M respectively are arranged in the form of a square such that their unlike poles are in contact. Then the resultant magnetic moment of the system is-

A
2M
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B
22M
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C
2M
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D
3M
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Solution

The correct option is B 22M



Mres=(2M)2+(2M)2=8M2

=22M

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (B) is the correct answer.

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