AIPMT PRELIMS2005Physics-Magnetism
AIPMT PRELIMS 2005 Physics Torque on a Current Loop MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that l is in plane of the coil. If due to a current i in the triangle a torque τ acts on it, the side l of the triangle is:
A
(2/√3) (τ/Bi)¹/₂
B
(2/√3) (τ/Bi)
C
2(τ/√3 Bi)¹/₂
D
(1/√3) (τ/Bi)
Correct Answer
Option C
Detailed Explanation
The torque τ on a current-carrying loop in a magnetic field is given by τ = nBiA, where A is the area of the loop. For an equilateral triangle, A = (√3/4)l². Solving for l gives the correct expression.
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