Quiz Review answers

1. What is the electrostatic force between two metal spheres, each having 5 C of charge. The balloons are 0.30 m apart.

2. Suppose that two point charges, each with a charge of +1 Coulomb are separated by a distance of 1 meter. (a) Will they attract or repel? (b) Determine the magnitude of the electrical force between them. a. Like charge repel. b.

3. Two balloons are charged with an identical quantity and type of charge: -0.0025 C. They are held apart at a separation distance of 8 m. Determine the magnitude of the electrical force of repulsion between them.

4. Two charged boxes are 4 meters apart from each other. The blue box has a charge of +0.000337 C and is attracting the red box with a force of 626 Newtons. Determine charge of the red box. Remember to indicate if it is positive or negative.

5. A piece of styrofoam has a charge of -0.004 C and is placed d m from a piece of salt with a charge of -0.003 C. The force is 12000N.

6. A helium nucleus has charge +2e and a neon nucleus +10e, where e = 1.60 x 10-19 C. With what force do they repel each other when separated by 3 x 10-9 meters?

7. If two equal charges, each of 1 coulomb, were separated in air by a distance of 1 km, what would be the force between them? Repulsion

8. Determine the force between two free electrons spaced 1 angstrom (10-10 m) apart.

9. The force of repulsion between two argon nuclei is 7.4 x 10-8 N when separated by what distance. The charge on an argon nucleus is +18e.

10. Two equally charged pith balls are 3 cm apart in air and repel each other with a force of 4 x 10-5 N. Compute the charge on each ball.

11. Two small equal pith balls are 3 cm apart in air and carry charges of +3 x 10-9 and –12 x 10-9 C respectively. Compute the force of attraction.