Two charges are separated by a certain distance. If the magnitude of one charge only is doubled, the force on each charge is a. halved.
b. doubled.
c. tripled.
d. quadrupled.

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

How do you know how many valence electrons an atom has?

If a car has a speed of 20 m/s, how long will it take to go 155 m? a. 3100 s b. 135 s c. 2.1 s d. 7.8 s