Problem description:
I must hand in my homework tomorrow. My brothers and sisters are very grateful for your quick answer.
Analysis:
1 coulomb is equivalent to about 6.25× 10 18 electrons. The electric quantity of an electron is-1.6×10 (-19).
The electric quantity of 100 electrons is equal to-1.6×10 (-17), and the negative sign indicates that it is negatively charged.