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Question

Three magnets of the same length but moments M, 2M and 3M are arranged in the forms of an equilateral triangle with opposite pole nearer, the resultant magnetic moment of the arrangement is?

A
6M
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B
Zero
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C
3M
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D
32M
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Solution

The correct option is C 3M
M=(M2Mcos603Mcos60)^i+(2Mcos303Mcos30)
M=32M^i32M
M=|M|= (32)2+(32)2M=3M
Magnetic moment =3M

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