PhysicsLAB Practice Problems
Charging

Directions: On this worksheet you will continue working with charges at rest.

Question 1   A metal sphere has a net negative charge of 8 × 10-6 coulomb. Approximately how many more electrons than protons are on the sphere?
Question 2  Two protons are located one meter apart. Compared to the gravitational force of attraction between the two protons, the electrostatic force between the protons is
Question 3  In the diagram below, a positive charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.6 meter from the central charge. Sphere B has a charge of –2q and is located 0.12 meters from the central charge.

If the magnitude of the force on the central charge due to sphere A is F, then what is the magnitude of the force on the central charge due to sphere B?
Question 4  When a neutral metal sphere is charged by contact with a negatively charged amber rod, the sphere
Question 5  Two similar metal spheres, A and B, have charges of +2.0 × 10–6 coulomb and +1.0 × 10–6 coulomb. The magnitude of the electrostatic force on A due to B is 4.8 newtons. What is the magnitude of the electrostatic force on B due to A?
Question 6  Which of the following demonstrations was not a result of charge polarization?
Question 7  Metal sphere A has a charge of –4 units and an identical metal sphere, B, has a charge of +6 units. If the spheres are brought into contact with each other and then separated, the charge on sphere B will be
Question 8  What is the net electrical charge on a magnesium ion that is formed when a neutral magnesium atom loses two electrons?


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