Question

A body contains charge of 10 micro coulomb. After conduction, the charge on the body becomes -2.8 micro coulomb. The number of electrons gained by this charged body

Answer 1

`n=4.5* 10^(13)`

Step-by-step explanation:

Initial charge,
`q_1=10\mu C`

After conduction, charge on the body becomes,
`q_2=-2.8\mu C`

We need to find the number of electrons gained by this charged body.

Net charge,

`q=q_1+q_2\\\\=10+(-2.8)\\\\=7.2\ \mu C`

Let n be the number of electrons gained by this charged body. So,

`q=ne\\\\n=(q)/(e)\\\\n=(7.2* 10^(-6))/(1.6* 10^(-19))\\\\=4.5* 10^(13)`

So,
`4.5* 10^(13)` electrons gained by this charged body.