STANDARDPhysics-Magnetism
STANDARD Physics Magnetic Dipole MCQ Question
Type: MCQ-conceptual-Medium
A dipole of magnetic moment M = 30ĵ Am² is placed along the y-axis in a uniform magnetic field B = (2î + 5ĵ) T. The torque acting on it is
A
-40k̂ Nm
B
-50k̂ Nm
C
-60k̂ Nm
D
-70k̂ Nm
Correct Answer
Option C
Detailed Explanation
The torque τ on a magnetic dipole in a magnetic field is given by τ = M × B. Here, M = 30ĵ and B = (2î + 5ĵ). Calculating the cross product, τ = 30ĵ × (2î + 5ĵ) = 60(-k̂) = -60k̂ Nm.
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