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A neutral conducting solid sphere of rad...


A neutral conducting solid sphere of radius R has two spherical cavities of radius a and b as shown in the figure. Centre to centre distance between two cavities is c. `q_a and q_b`charges are placed at the centres of cavities respectively. The force between `q_a and q_b` is

A

`1/(4piepsilon_0).(q_aq_b)/(c^2)`

B

`1/(4piepsilon_0)q_aq_b(1/a^2+1/b^2)`

C

zero

D

insufficient data

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