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Q.

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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a

Couple on loop R will be the highest  

b

Couple on loop P will be the highest

c

Couple on loop S will be the highest

d

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×A. So, it will also be maximum for  loop S.

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