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Question: An insulated conductor initially free from charge is charged by repeated contacts with a plate which...

An insulated conductor initially free from charge is charged by repeated contacts with a plate which after each contact is replenished to a charge Q. If q is the charge on the conductor after first operation then the maximum charge which can be given to the conductor is-

A

QqQ−q\frac{Qq}{Q - q}

B

QqQ+q\frac{Qq}{Q + q}

C

Q

D

q

Answer

QqQ+q\frac{Qq}{Q + q}

Explanation

Solution

mg = qE or mg = (ne) E \ n = mgeE\frac { \mathrm { mg } } { \mathrm { eE } }