Help pls A point charge q is surrounded by a charge uniformly distributed in a spherical crust of radii R1 = R and R2 = 2R, concentric with the point charge. The potential at a point P distant 4R from the point charge is known to be zero.

As a function of q and R, it is requested:

1) Value of the charge Q distributed in the spherical crust and the density volumetric loading.

2) The electric field in the following areas:

zone A: 2R
zone B: R
zone C: 0

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