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-10 mu C, 40mu C and q are the charges o...

`-10 mu C, 40mu C` and q are the charges on three identical spherical conductors P Q and R respectively. Now P and Q attract each other with a force F when they are separated by a distance d. Now P and Q are made in contact with each other and then separated. Again Q and R are touched and they are separated by a distance 'd'. The repulsive force between Q and R is 4F. Then the charge q is

A

`10 mu C`

B

`30 mu C`

C

`40 mu C`

D

`65 mu C`

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The correct Answer is:
D
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