Name three constituents of an atom and state the nature of charge on each of them.

'The charge on a body is 1.5 e'. Comment on this statement.

Select conductors of electricity from the following — Copper wire, silk thread, pure water, acidulated water, human body, glass, mercury.

What is the other name for the unit :

(a) Joule per Coulomb

(b) Coulomb per second