RE-NEET2024Physics-Magnetism
RE-NEET 2024 Physics Magnetic Dipole MCQ Question
Type: MCQ-numerical-Medium-Class 12
The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, 1.0 × 10⁻² A m² and 10⁻⁶/π² kg m². If it completes 10 oscillations in 10 s, the magnitude of the magnetic field is:
A
0.4 T
B
4 T
C
0.4 mT
D
4 mT
Correct Answer
Option C
Detailed Explanation
The time period T of oscillation is given by T = 2π√(I/MB). Solving for B using the given values, B = 0.4 mT.
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