From a cylinder of radius R, a cylinder of radius R/2 is removed, as shown. Current…

Physics · JEE Advanced · NTA Exams — Magnetic Effects of Current and Magnetism

From a cylinder of radius R, a cylinder of radius R/2 is removed, as shown. Current flowing in the remaining cylinder is I. Magnetic field strength is

1. zero at point A
2. zero at point B
3. \(\frac{\mu_{0} \mathrm{I}}{3 \pi \mathrm{R}}\) at point A
4. \(\frac{\mu_{0} \mathrm{I}}{3 \pi \mathrm{R}}\) at point B

Answer

(C) _ 0 I 3 R at point A, (D) _ 0 I 3 R at point B

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