4a) If a capacitor has been left in a steady circuit for a long time, what can y

ID: 2152065 • Letter: 4

Question

4a) If a capacitor has been left in a steady circuit for a long time, what can you say about the current going through it?

b) The circuit below has been left on for a long time. What is the voltage across the capacitor?

c) What is the charge on the capacitor?

d) What is the energy stored in the capacitor?

e) The switch is opened (see figure below). Immediately after the switch is opened, what is the charge on the capacitor?

f) After the switch has been opened for a long time, what is the charge on the capacitor?

g) Write the charge on the capacitor as a function of time, assume that the switch is opened at time t=0

h) What is the final energy of the capacitor, and what makes this different from the answer to part d?

a) Current will become 0, since after 5 cycles of its time constant, it will behave as open circuit.

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