PhysicsLAB Practice Problems
Coulomb's Law

Topics: On this worksheet you will investigate properties of Coulomb's Law when multiple charges are present.

Page Directions The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.

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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 37 cm. What force would a +12 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 -12 µC be placed if the force it experiences is to be zero?
Question 7  A conducting sphere carries a charge of -12 µC. Which of the following statements is correct?


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