Question

Two bodies X and Y carry charges -6.6 microcolumb and -5 microcolumb. How many electron should be transferred from X to Y so they acquire equal charge

Answer 1

The difference between -5 mC and -6.6 mC is 1.6 mC. Half of this amount, 0.8 mC, is how much charge the -6.6 mC body must give to the other body so that they are equally charged.

0.8 mC x 6.24150975⋅10^15e/mC
= _______ electrons

Answer 2

Two bodies X and Y carry charges −6.6×10
−6
C and −5×10
−6
C respectively.
⇒ X has excess charge of −1.6×10
−6
C composed to Y.
⇒ X has to give a charge −0.8×10
−6
C if charge on both have to be same.
The charge on one electron is −1.6×10
−19
C
⇒ Number of electrons required to transfer a charge of −0.8×10
−6
C
=
−1.6×10
−19

−0.8×10
−6

​
=5×10
12