From a cylinder of radius \( R \), a cylinder of radius \( R / 2 \)...

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From a cylinder of radius \( R \), a cylinder of radius \( R / 2 \) is removed as shown in the figure. Current flowing in the remaining cylinder is \( I \). Magnetic field strength is
\( \mathrm{P} \)
W
(a) zero at point \( A \)
(b) zero at point \( B \)
(c) \( \frac{\mu_{0} I}{3 \pi R} \) at point \( A \)
(d) \( \frac{\mu_{0} I}{3 \pi R} \) at point \( B \)
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