A polythene piece rubbed with wool is found to have a negative charge of 3 × 10^-7 C.

Explanation:

Given,

q = 3 ×10^-7 C

e = 1.6 × 10^-19 C

(a) The number of the electron,

The charge is quantized, q = ne

(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 × 9.1 × 10^-31

M = 17.1 × 10^-19 kg

Final Answer:

Hence of the number of electrons is n = 1.875 × 10¹² electrons and transfer of mass of M = 17.1 × 10^-19 kg.