Physics-
General
Easy
Question
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
- Couple on loop P will be the highest
- Couple on loop Q will be the highest
- Couple on loop R will be the highest
- Couple on loop S will be the highest
The correct answer is: Couple on loop S will be the highest
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 
So, it will also be maximum for loop S.
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