Question

Calculate the net charge on a substance con- sisting of a combination of 9.0 x 10^13 protons and 4.1 x 10^13 electrons. The elemental charge is 1.6 x 10-19 C. Answer in units of C.

Answer 1

Net charge,
`Q=7.84* 10^(-6)\ C`

Step-by-step explanation:

Number of protons,
`n_p=9* 10^(13)`

Number of electrons,
`n_e=4.1* 10^(13)`

Charge on electron,
`q_e=-1.6* 10^(-19)\ C`

Charge on proton,
`q_p=1.6* 10^(-19)\ C`

Net charge acting on the substance is :

`Q=n_eq_e+n_pq_p`

`Q=4.1* 10^(13)* (-1.6* 10^(-19))+9* 10^(13)* 1.6* 10^(-19)`

`Q=0.00000784\ C`

or

`Q=7.84* 10^(-6)\ C`

So, the net charge on the substance is
`7.84* 10^(-6)\ C`. Hence, this is the required solution.