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Questions  >>  CBSE XII  >>  Physics  >>  Electromagnetic waves

A variable frequency a.c source is connected to a capacitor .How will the displacement current change with decrease in frequency ?

$\begin{array}{1 1} \text{As conduction current decreases , frequency decreases } \\ \text{As conduction current increases , frequency decreases } \\ \text{There will be no charge} \\ \text{As conduction current decreases , frequency decreases initially and then increases }\end{array} $

1 Answer

Solution :
Current through the capacitor is $I= \large\frac{E}{X_c}$
$\qquad= \large\frac{E}{1/Cw}$
$\quad = ECw$
$\qquad= 2 \pi \alpha CE$
$I \alpha \gamma$
Hence decrease in the frequency $\alpha $ of a.c . source decrease the conduction current .
so thee will be decrease in the displacement current in the circuit .
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