Question

A polythene piece is rubbed with wool. It is found to acquire a
negative charge of 3X 10 -7 C. Estimate the number of electrons
transferred to the polythene piece.

Answer 1

Explanation:

q=3×10

−7

C

e=1.6×10

−19

C

(a) The number of the electron,

The charge is quantized, q=ne

n=

e

q

=

1.6×10

−19

3×10

−7

n=1.875×10

12

electrons

(b) Yes, mass of electron is transferred.

We know that, m=9.1×10

−31

kg

The transfer of mass, M=nm

M=1.875×10

12

×9.1×10

−31

M=17.0×10

−19

kg