CUET · PHYSICS · PYQ PAPER 2025
Two wires of equal lengths carrying equal currents bent in the form of two loops, one in square shape and the other in circular shape having one turn only are suspended in same, uniform magnetic field perpendicular to the plane of loops. Choose the correct option
- A both the loops experience equal torque
- B both the loops experience zero torque
- C Square loop experiences smaller torque
- D Circular loop experiences the smaller torque
Answer & Solution
Correct Answer
(C) Square loop experiences smaller torque
Step-by-step Solution
Detailed explanation
\( \tau = IAB \) \( P_{square} = 4a = L \Rightarrow A_{square} = (L/4)^2 = L^2/16 \) \( C_{circle} = 2\pi r = L \Rightarrow A_{circle} = \pi (L/(2\pi))^2 = L^2/(4\pi) \) \( 4\pi \approx 12.56 A_{square} \) Square loop experiences smaller torque
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