Question

Please explain the answer of 7 no. Question.

Answer 1

Answer:

The charge on one electron = -1.6*10^-19 Coulombs

Now,

the number of electrons = 1 billion = 10^9 electrons

Therefore, total charge on the body

= (10^9)(-1.6*10^-19) Coulombs

or -1.6*10^-10 Coulombs and hence option (C) would be the correct answer.

Answer 2

Answer:

1.6*10^-10 i.e. third option

Explanation:

charge of an electron= 1.6*10^-19

IF a billion(10^9) electrons are added then charge become 1.6*10^-19 *10^9 = 1.6*10^-10