#
Capacitor Questions

**Q10.** A student sets up the circuit shown in the diagram.

(a)

(i) She moves the switch from X to Y. Explain what happens to the capacitor.

**(2 marks)**

(ii) Sketch a graph to show how current varies with time from the moment the switch touches Y. Indicate typical values of current and time on the axes of your graph.

**(3 marks)**

(iii) Describe how the graph would appear when the switch is moved back to X.

**(2 marks)**

(b) Calculate the maximum energy stored on the capacitor in this circuit.

**(2 marks)**

(c) The student wants to produce a time delay equal to the time it takes for the potential difference across the capacitor to fall to 0.07 of its maximum value. Calculate this time delay.

**(2 marks)**

**(Total 11 marks)**