BoH Wrong

Question 1

Explain why the rate of change of the potential difference decreases as the capacitor discharges.

Answer 1

• As the capacitor discharges so does the PD

-Current through the resistor decreases
(I is proportional to V)

-Rate at which charge leaves the capacitor decreases (Since I=Q/t)

-the rate of change of charge is proportional to the rate of change of PD (Since v is proportional to Q)

Question 2

What is energy proportional to for capacitor energy stored.

Answer 2

The energy is proportional to the charge squared (E ∝ Q^2)

Question 3

Give Reasons why a capacitoris not a suitable source for powering a cordless telephone.

Answer 3

-Capacitor would be impossibly large
-Capacitor would need recharging very frequently
-Capacitor voltage would fall continuously while in use.