Assertion : The charge on any body can be increased or decreased in terms of e.
Reason : Quantisation of charge means that the charge on a body is the integral multiple of e.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

A

Explanation

Protons and electrons are the only basic charges in the universe. All the observable charges have to be intergral multiple of e. Thus if a body contains `n_(1)` electrons and `n_(2)` protons, the total amount of charge on the body is `n_(2)e+n_(1)(-e)=(n_(2)-n_(1))e.` Since `n_(1)and n_(2)` are intergers, their difference is also an interger. Thus the charge on any body is always an integral multiple of e and can be increased or decreased in terms of e.