Question

The quantum of electric charge in e s u?

• A. $4.78\times {10}^{-10}$
• B. $+1.6\times {10}^{-19}$
• C. $2.99\times {10}^9$
• D. $-1.6\times {10}^{-19}$

Answer 1

The correct option is A

$4.78\times {10}^{-10}$

Quantum of electric charge:

1. Since protons and electrons are the only charged particles constituting the matter, the charge on an object must be an integral multiple of $\pm e$.
2. The charge possessed by an object cannot be a fraction of $\pm e$.

$q=\pm ne$

One coulomb is the amount of charge transferred in one second by a steady current of one ampere.

1. The value of 1 quantum is the magnitude of the charge on an electron which is equal to $+1.6\times {10}^{-19}$.
2. But in e s u its value is $4.78\times {10}^{-10}$.

Therefore, the correct option is (A).