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A charge Q is kept at the centre of a co...

A charge Q is kept at the centre of a conducting sphere of inner radius `R_(1)` and outer radius `R_(2)`. A point charge q is kept at a distance `r(gt R_(2))` from the centre. If q experiences an electrostatic force 10 N then assuming that no other charges are present, electrostatic force experienced by Q will be :

A

`-10 N`

B

`0`

C

`20 N`

D

none of these

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The correct Answer is:
B
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