How can object be charged with contact ?
When we touch a pith ball with an electrified plastic rod, some of the negative charges on the rod are transferred to the pith ball and it also gets charged. Thus the pith ball is charged by contact. It is then repelled by the plastic rod but is attracted by a glass rod which is oppositely charged.
A soap bubble is given a negative charge, then its radius
Who represented the quantization of electric charge first and on what basis ?
Charge on $\alpha $ - particle is
How much positive and negative charge is there in a cup of water $(250\;gm)$?
Is the induced charge on the surface of metal or inside it ?