Question

A body has a net charge of -1×10^-10C.how many excess electrons are contained in the body​

Answer 1

Answer:

6.25 x 10^8 electrons

Explanation:

We know that charge on one electron is 1.6 × 10-19 coulombs and also that an electron carries a negative charge, that is why the body mentioned in question statement has a negative charge indicating that electrons are in excess in the body.

Net charge = Charge on one electron x number of electrons

1×10^-10 = 1.6 × 10^-19 x number of e

Number of electrons = 6.25 x 10^8 electrons

Answer 2

Given :

net charge , Q = -1 × 10^ -10 Coulomb

charge of electron , e = - 1.602 x 10^ -19 Coulomb

To find :

Number of excess electrons .

Solution :

we know ,

Q = n * e

where n is number of electrons .

now ,

    -1 × 10^ -10 C = n * ( - 1.602 x 10^ -19 C )

    n = ( -1 × 10^ -10 C ) / ( - 1.602 x 10^ -19 C )

=> n = 6.25 x 10 ^ 8

6.25 x 10 ^ 8 excess electrons are contained in the body​.