Question

Determine the total charge on 75.0kg of electrons.

Answer 1

One electron of mass
$9.1 \times {10}^{ - 31}$
kg

carries,
$1.6 \times {10}^{ - 19}$
Coloumb charge.



The number of electrons in 75 kg will be,

$\frac{75}{9.1 \times {10}^{ - 31} } \\ = 8.2 \times {10}^{31}$

The total charge will be of,

$8.2 \times {10}^{31} \times 1.6 \times {10}^{ - 19} \\ = 13.1 \times {10}^{13} \\ = 1.3 \times {10}^{14}$
Columb.