Calculate the net charge on a substance con-
sisting of a combination of 1.9 × 10^13 protons
and 3.9 × 10^13 electrons.
Answer in units of C.
To calculate the net charge on a substance, you need to subtract the total number of electrons from the total number of protons.
Given that there are 1.9 × 10^13 protons and 3.9 × 10^13 electrons, you can calculate the net charge as follows:
Net charge = (total number of protons) - (total number of electrons)
Net charge = 1.9 × 10^13 - 3.9 × 10^13
Note that the charges of protons and electrons are opposite. Protons have a positive charge (+1.6 × 10^-19 C) while electrons have a negative charge (-1.6 × 10^-19 C).
Now, let's substitute the given values into the equation:
Net charge = (1.9 × 10^13) * (1.6 × 10^-19) - (3.9 × 10^13) * (1.6 × 10^-19)
Multiplying the numbers together:
Net charge = 3.04 × 10^-6 C - 6.24 × 10^-6 C
Finally, subtracting the charges:
Net charge = -3.2 × 10^-6 C
Therefore, the net charge on the substance is -3.2 × 10^-6 C.