Question

How many electrons must be removed from a piece of metal to give it +1 ×10^-7 C of charge?

a) 6.242 × 10^12
b) 1.602 × 10^6
c) 9.874 × 10^4
d) 2.345 × 10^15

Answer 1

To give a piece of metal a charge of +1 ×10^-7 C, approximately 6.242 × 10^12 electrons must be removed from it.

Step-by-step explanation:

To find the number of electrons that must be removed from a piece of metal to give it a charge of +1 ×10^-7 C, we use the formula:

number of electrons = total charge / charge per electron

The charge per electron is the elementary charge, which is approximately 1.602 × 10^-19 C. So, the number of electrons is:

number of electrons = (+1 ×10^-7 C) / (1.602 × 10^-19 C)

Calculating this, we get:

number of electrons ≈ 6.242 × 10^12