A conductor has been given a charge `-3 xx 10^(-7) C` by transferring electron. Mass increase (in kg) of the conductor and the number of electrons added to the conductor are respectively

Options

A. `2xx10^(-16) and 2xx10^(31)`
B. `5xx10^(-31) and 5xx10^(19)`
C. `3xx10^(-19) and 9xx10^(16)`
D. `2xx10^(-18) and 2xx10^(12)`

Answer

D

Explanation

`q=-3 xx10^(-7) C`
Since, q = ne
`n rarr ` number of electron
`n=q/e = (-3 xx10^(-7))/(-1.6 xx10^(-19))~~2xx10^(12)`
`m_e = 9.1 xx10^(-31) kg`
Increased mass of the conductor `=m_e xxn`
`=9.1 xx10^(-31) xx2 xx10^(12)`
`=18.2 xx10^(-19) kg`
`= 1.82 xx10^(-18) kg`
`~~2 xx10^(-18) kg`