Question

The specific charge of electron is  

(A) \(1 . 8 \times 10 ^{ - 19 }\) C / kg

(B) \(1.67 \times 10 ^ {- 19} \) C / k g

(C) \(1 . 8 \times 10 ^{ 11 }\) C / kg

(D) \(6.67 \times 10 ^ {11 }\) C / kg

Answer 1

Correct option is : (C) \(1 . 8 \times 10 ^{ 11 }\) C / kg

Positive charge: A body having a deficiency of electrons. 

Negative charge: A body having an excess of electrons. 

We know that the charge on the electron is \(1.6\times 10^{-19}C\), and the mass of the electron is \(9.1 \times 10^{-31}Kg\).

And the specific charge of any particle is the charge per kilogram of the particle.

Hence to find the specific charge we divide the charge of one electron by the mass of a single electron.

\(\therefore\ \) Specific charge = \((1.6\times 10^{-19}) / (9.1\times 10^{-31}) = 1.8\times 10^{11}\ C/kg\)

Answer 2

Correct option is (C) \(1 . 8 \times 10 ^{ 11 }\) C / kg