Two concentric spherical shells carry uniformly distributed charges Q (at radius a) and Q (at radius b a) They are immersed in a uniform magnetic field B B 0 z (a) Find the angular momentum of the fields (with respect to the center) (b) Now the magnetic field is gradually turned off Find the torque on each sphere, and the resulting angular momentum of the system

Question: Two concentric spherical shells carry uniformly distributed charges +Q (at radius a) and Q (at radius b > a). They are immersed in a uniform

Two concentric spherical shells carry uniformly distributed charges +Q (at radius a) and −Q (at radius b > a). They are immersed in a uniform magnetic field B = B₀ ẑ
(a) Find the angular momentum of the fields (with respect to the center).
(b) Now the magnetic field is gradually turned off. Find the torque on each sphere, and the resulting angular momentum of the system.

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