A positive charge $q$ is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are displaced by a small distance $\vec l $ . Force on charge $q$ is :
A positive charge $q$ is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are displaced by a small distance $\vec l $ . Force on charge $q$ is :
- A
in the direction parallel to vector $\vec l $
- B
in radial direction
- C
in a direction which depends on the magnitude of charge density in sphere
- D
direction can not be determined.
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