MCQ
Choose the correct answer from the alternatives given. The conduction current is the same as displacement current when the source is.
- ✓$AC$ only
- B$DC$ only
- Cboth $AC$ and $DC$
- Dneither $AC$ nor for $DC$
✓
Answer
Correct option: A.
$AC$ only
For a capacitor, we have:
$Q = CV$
If $Q$ is changing, there will be a current in capacitor plates,
$\text{I}=\frac{\text{dQ}}{\text{dt}}=\frac{\text{CdV}}{\text{dt}}$when voltage across the capacitor is constant, $\frac{\text{dV}}{\text{dt}}=0$
therefore,$ I = 0$
It implies that, for a $DC ($constant$)$ voltage, the capacitor current is zero.
Hence, for a $DC$ source the conduction current and displacement current $($capacitor current$)$ are not same.
Whereas, by Maxwell's equation for a time varying voltage $(AC$ voltage$),$ both conduction and displacement currents are same.
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