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A long cylindrical conductor of radius a...

A long cylindrical conductor of radius a has two cylindrical cavities of diameter a through its entire length as shown in cross-section in figure. A current `I` is directed out of the page and is uniform throughout the cross-section of the conductor. Find the magnitude and direction of the magnetic field in terms of `mu_0,I,r` and a.

(a) at point `P_1` and (b) at point `P_2`

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