PhysicsLAB Practice Problems
Coulomb's Law

Directions: On this worksheet you will investigate properties of Coulomb's Law.

Question 1  Three point charges are placed on the x-axis as shown below. Find the net force on the 3.0 µC charge.
Question 2  In the Bohr model of the hydrogen atom, an electron orbits a stationary proton at a radius of 0.53 Aº. How much kinetic energy does the electron possess?
Question 3  An initially neutral metal sphere is grounded through a switch, and a positively charged balloon is brought near it. After a few moments, the switch is opened and then the balloon is taken away. The sphere will now be
Question 4  Three charges are placed on three corners of a square as shown below. Each side of the square is 39 cm. What force would a +15 µC charge feel when placed at the vacant corner?
Question 5  Which of the following statements is NOT true when comparing electrical forces and gravitational forces?
Question 6  Two charges are placed on the x-axis as shown on the diagram below. Where should a third charge -15 µC be placed if the force it experiences is to be zero?
Question 7  A conducting sphere carries a charge of -15 µC. Which of the following statements is correct?

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