81.
A spherical shell of inner radius \( a \) and outer radius \( b \) carries a uniform volume charge density. At a radius between the two, the field
Answer: A
Gauss's law counts only what is enclosed, so at an intermediate radius the field is set by the charge lying between the inner surface and that radius. It is zero for radii below the inner surface and falls as the inverse square beyond the outer one.
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