Question

A metal rod A is to be charged positively by using another charged rod B. What should be the kind of charge on the rod B if charging is to be done by conduction?

Answer 1

Rod A is uncharged and Rod B is charged body.
A is to be charged positively by touching i.e. by conduction. So rod B should have a similar charge as is required by A i.e. positively.
So rod B should be positively charged,
∴ By conduction, the same kind of charge is produced and shared by the uncharged body.