20 . An electron in an electric field is suspended above the earth’s surface. Which of the following
diagrams correctly shows the forces acting on this electron?
(A)
(B)
(C)
(D)
(E)
Circuits
21 . Which of the following will increase the capacitance of a parallel plate capacitor?
(A) increasing the charge stored on the plates
(B) decreasing the charge stored on the plates
(C) increasing the separation between the plates
(D) decreasing the separation between the plates
(E) decreasing the area of the plates22 . A 10-V battery is connected to two parallel 10-Ω resistors, as shown above. What is the current
through and voltage across each resistor?