Question

it 1019 electrons are removed from a neutral metal plate, then what is the electric charge(in coulomb) on it?how?
a)-1.6
b)1.6
c)10-19
d)1019

Answer 1

Charge on an electron is a constant I. e. -1.6*10^-19C. So if we remove an electron from a substance, we remove a charge of -1.6*10^-19C. Therefore by quantization of charge, the next 4th charge gained on the substance is equal to +1.6*10^-19C.
So if we remove 10^19 electrons, the net charge on the substance is
q=ne
=>q=10^19*1.6*10^-19C
=>q=1.6C
Therefore answer will be (b) 1.6C

Answer 2

The answer is option b 1.6C

q= ne

=10^19 × 1.6×10^-19

=1.6C