Two point charges of +30.0 μC and -9.00 μC are 20.0 cm apart, with the negative charge to the right of the positive charge. Taking to the right as being the positive x-direction, what is the electric field midway between these two charges?

A -4 nC point charge is located at -3 m along the x-axis. What is the electric potential at the origin?

A piece of wire 100 meters long has a resistance of 0.10 Ω. A current of 20 A runs through the wire, with a “voltage” at the input of 240 volts. (Note the input voltage of 240 volts is not the voltage drop…not delta(V)). What is the power delivered at the far end of the wire (or power “transmitted”)?

The electron volt (eV) is a unit of:

Two point charges, each of magnitude 6μC, exert a force of 1.4 N on each other. What is the distance between the charges?

A sphere has a net charge of -4.8 x 10-17 C. How many excess electrons are there on the sphere?

A proton traveling horizontally enters a region in which a uniform electric field is directed upward. What is the direction of the force on the proton?

Three point charges are located along the x-axis: q1 = +5.0 μC is at 20 cm, q2 = +4.0 μC is at 0 cm, and q3 = +10.0 μC is at –30 cm. What is the electrostatic force exerted on q2 by q1?

If the distance between two charges is halved, the electrostatic force is:

The removal of the voice box is called which of the following?