47.

1. In an atom, an electron and a proton are separated by a distance of 1 x 10^-8m.

• a) Find the force on the electron.
• b) Assuming a circular orbit (which wouldn't happen, but we'll go with it) Find the velocity of the electron.

2. If two spheres, each with a charge of 5C have a force between them of 25N, how far apart are they?

3. There are three particles in a straight line, all the same distance apart: particle A, particle B, and particle C. If particle A has a charge of +q, and particle B has a charge of -q, and particle B is attracted to particle C, what does that tell you about the charge of particle C?

4. A particle with a charge of +3q exerts a force F on a particle with a charge of -q. What force is being exerted on the particle with a charge of 3q by the -q particle?

5. There are three particles in a straight line that each have the exact same charge. Particle A is 3cm from particle B, particle B is 1cm from particle C. The electric force exerted by particle A on particle B is 4 x 10^-2 N. What is the force exerted by particle C on particle B?