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Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct?

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Couple on loop R will be the highest

Couple on loop P will be the highest

Couple on loop S will be the highest

Couple on loop Q will be the highest

answer is D.

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Detailed Solution

Couple of force on loop S will be maximum because for same perimeter the area of loop will be maximum and magnetic moment of loop = $i \times A$ . So, it will also be maximum for loop S.

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