10uC ,40uCand 'q'are the charges on three identical spherical conductors 'P' 'Q' 'R' respectively now P and Q attract each other with a froce F when they seperates by a distance D now P and Q are made in contact with each other and are separated .Again Q and R are touched and they are separated by a distance D the repulsive froce between Q and R is 4F .then the charge Q is
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after BOTH touchings, charge on P= 25 C, Q= 15 C, R= 15 C.
Explanation:
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