Question

A parallel plate capacitor of capacitance $20\mu F$ is being charged by a voltage source whose potential is changing at the rate of $3V/s$. The conduction current through the connecting wires and the displacement current through the plates of the capacitor would be respectively

• A. 0 $\mu A$, $60\mu A$
• B. $60\mu A$, $60\mu A$
• C. $60\mu A$, $0\mu A$
• D. $0\mu A,0\mu A$

Answer 1

The correct option is B $60\mu A$, $60\mu A$

$V=\frac{Q}{C}Q=CV\therefore i=C\frac{dV}{dt}=20\mu F\times 3V/s=60\mu A$
Also, conduction current in wires is equal to displacement current between the plates of capacitor.