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
2√2M
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C
√2M
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D
√3M
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Solution
The correct option is B2√2M
Mres=√(2M)2+(2M)2=√8M2
=2√2M
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Hence, (B) is the correct answer.