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  4. Four wires each of length 2.0 n 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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Q. Four wires each of length $2.0\, n$ 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?Physics Question Image

Chhattisgarh PMTChhattisgarh PMT 2005

Solution:

$ \therefore $ Couple $ \tau =BIA $ For given measurements only area of circle will be maximum and therefore torque will be maximum.
Hence, couple on loop $S$ will be highest.