AIPMT PRELIMS2010Physics-Magnetism
AIPMT PRELIMS 2010 Physics Magnetic Field Due to Current MCQ Question
Type: MCQ-numerical-Medium-Class 12
A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic induction in Wb/m² at the centre of the ring is
A
rac{\mu_0 qf}{2R}
B
rac{\mu_0 qf}{2\pi R}
C
rac{\mu_0 q}{2\pi fR}
D
rac{\mu_0 q}{2fR}
Correct Answer
Option A
Detailed Explanation
The magnetic induction at the center of a rotating charged ring is given by B = rac{\mu_0 qf}{2\pi R}, where is the permeability of free space, q is the charge, f is the frequency, and R is the radius.
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