Rubbing a comb on hair makes the comb get – 0.4C. (a) Find which ma

1.	Rubbing a comb on hair makes the comb get – 0.4C. (a) Find which material has lost electron and which one gained it.(b) Find how many electrons are transferred in this process.
Answer» (a) The material is comb which gained electrons and the hair gained it. Charge on 1 electron, e = 1.6 × 10^-19 C q = ne or n =\(\frac{q}{e}\) n = \(\frac{0.4}{1.6}\) x 10^-19 = 0.25 x 10¹⁹ = 2.5 x 10¹⁸

Rubbing a comb on hair makes the comb get – 0.4C. (a) Find which material has lost electron and which one gained it.(b) Find how many electrons are transferred in this process.

Answer»

(a) The material is comb which gained electrons and the hair gained it.

Charge on 1 electron, e = 1.6 × 10^-19 C

q = ne or n =\(\frac{q}{e}\)

n = \(\frac{0.4}{1.6}\) x 10^-19 = 0.25 x 10¹⁹ = 2.5 x 10¹⁸