A positive charge \( \mathrm{q} \) is placed in a spherical cavity ...

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A positive charge \( \mathrm{q} \) is placed in a spherical cavity made in a positively charged sphere. The centres of sphere and cavity are having a small distance \( \vec{l} \). Force on charge \( \mathrm{q} \) is :
\( \mathrm{P} \)
(A) in the direction parallel to vector \( \vec{l} \)
W
(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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