PHYSICS 2220 - PRACTICE EXAM #2
1. For the circuit shown at right, how
much charge is on capacitor C2?
2. What is the area of each plate of a
1 μF capacitor if the plates are separated by 1 mm?
3. If the capacitor in the previous problem is attached to a
12 V battery, what is the magnitude of the electric field
between the plates?
4. Find the charge on each capacitor,
and the voltage across each
capacitor, in the circuit shown.
5. Find the energy stored in each capacitor in the previous
problem.
6. When a 2 Ω load resistor is attached to a battery with an
emf of 12 V, the power dissipated by the load resistor is
50 W. What is the internal resistance of the battery?
7. A 15 V battery has an internal
resistance of 0.5 Ω (shown below the
battery). What is the current i?
8. What is the voltage across the 4 Ω
resistor in problem 7?
9. What is the power dissipated by the 3 Ω resistor in problem 7?
10. A current of 2 A flows through the
4.5 Ω resistor. Find the voltage
between points a and b.
11. Write down three Kirchhoff's rules
that are sufficient to solve the
circuit shown.
12. An RC circuit with R = 2 x 104 Ω and C = 5 μF is charged with a
30 V battery. What is the time constant of the circuit?
13. In problem 12, find the time for the capacitor to reach 1/4
of its final charge Q, and find the final charge Q on the
capacitor.
