1. For the figure shown to the right, what is the electric field (magnitude and direction) and electric potential at points 1, 2, and 3 if a= 1 m and q= 1 nC?
2. A fixed, rigid rod with no net charge attracts a suspended pith ball as shown below. What is the sign of the net charge on the pith ball?
A. Positive
B. Negative
C. Neutral
D. We don't have enough information to determine the sign
3. Rank in order from largest-to-smallest the change in electric potential energy as a proton moves from point 1 to point 2 (ΔU_12), from point 1 to point 3 (ΔU_13), and from point 2 to point 3 (ΔU_23)) in the figure shown to the right. Use symbols such as >, <, and = in your ranking.
4. A proton moves near a stationary alpha particle along the arc shown below. Rank, in order from largest to-smallest, the speed of the proton at points 1 (v_1), 2 (v_2), and 3 (v_3). Use symbols such as >, <, and = in your ranking.
5. Which of the following integrals will correctly calculate the electric potential at a point P a distance aabove a uniformly charged thin rod of length L and linear charge density λ?
6. Two very long and very thin glass rods are uniformly charged with a linear charge density of λ= 10 nC/m and placed side-by-side a distance a=8.0 cm apart. What are the electric field vectors at points 1, 2, and 3 located at distances of a/4, a/2, and 3a/4 to the right of rod A? What would be the force vector exerted on a proton placed at point 3?
7. Two charged dust particles are a distance of 8.0 cm apart, as shown below. What amount of work would be required to move an electron from location 1 to location 2? If the electron is released from rest at location 1, what must its speed be at location 2?
