Q.
Four wires each of length 2.0 m are bent into four $P,\ Q,\ R\ \ \ and\ \ S$ and then suspended into a uniform magnetic field. Same current in passed in each loop
A) Couple on loop $P\ $ will be maximum
B) Couple on loop $Q$ will be maximum
C) Couple on loop $R$ will be maximum
D) Couple on loop $S$ be maximum
Explanation
(d) $\ \tau = NiAB\ \propto A$
For given periphery circle has maximum area.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.