STANDARDPhysics-Magnetism and Matter
STANDARD Physics Magnetic Moment MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Magnetic field at the centre of a circular loop of area A is B. The magnetic moment of the loop is
A
BA²/μ₀π
B
BA/√A
C
BA√A/μ₀
D
2BA√A/μ₀π
Correct Answer
Option D
Detailed Explanation
Let r be the radius of the circular loop. Therefore, A = πr² or r = √(A/π). The magnetic field at the centre of the loop is given by B = (μ₀I)/(2r). Solving for the magnetic moment, we find it to be 2BA√A/μ₀π.
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