Goal: Link energy conservation and electromagnetism
Source: 283-421 Change of total energy
uniform volume distribution of charge has radius R and total charge Q.
A point charge -q is released from rest at point b, which is a distance
3R from the center of the distribution. When the point charge reaches a,
which of the following is true regarding the total energy, E?
- Ea = -Eb
- Ea = -2Eb/3
- Ea = -3Eb/2
- Ea = -9Eb/4
- Ea = Eb
- Ea = 2Eb/3
- Ea = 3Eb/2
- Ea = 9Eb/4
- None of the above
- Cannot be determined
(5) Students often forget to include the kinetic energy,
especially after a lot of discussion of potential energy. Many will
simply misinterpret the energy to mean potential energy. Teasing apart
these issues is important.