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A conductor has been given a charge -3 x...

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

A

`2xx10^(-16) and 2xx10^(31)`

B

`5xx10^(-31) and 5xx10^(19)`

C

`3xx10^(-19) and 9xx10^(16)`

D

`2xx10^(-18) and 2xx10^(12)`

Text Solution

Verified by Experts

The correct Answer is:
D
`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`
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