1989E3. A battery with an emf of 20 volts is connected in series with a resistor of 300,000 ohms and an air-filled parallel-plate capacitor of capacitance 6 microfarads.
a. Determine the energy stored in the capacitor when it is fully charged.
The spacing between the capacitor plates is suddenly increased (in a time short compared to the time constant of the circuit) to four times its original value.
b. Determine the work that must be done in increasing the spacing in this fashion.
c. Determine the current in the resistor immediately after the spacing is increased.
After a long time. the circuit reaches a new static state.
d. Determine the total charge that has passed through the battery.
e. Determine the energy that has been added to the battery.