Question

An oil drop has a charge of $6.4\times {10}^{-19}$ C. Find out the number of electrons in the oil drop.

• A. 4
• B. 8
• C. 2
• D. 3

Answer 1

The correct option is A 4

We know, quantization of the charge = $Q=ne$
where n = whole number of electons
e = charge of the electron = $1.6\times {10}^{-19}$ C
Given, Q = $6.4\times {10}^{-19}$
= n $\times 1.6\times {10}^{-19}$
So n = 4