Same current is flowing in two a.c. circuits. First contains only… - Vidyadip

MCQ

Same current is flowing in two a.c. circuits. First contains only inductance and second contains only capacitance. If frequency of a.c. is increased for both, the current will

A
increase in first circuit and decrease in second
B
increase in both circuits
C
decrease in both circuits
✓
decrease in first circuit and increase in second

✓

Answer

Correct option: D.

decrease in first circuit and increase in second

(d) : Capacitive reactance
$
X_C=\frac{1}{\omega C}=\frac{1}{2 \pi \nu C}
$
Inductive reactance, $X_L=\omega L=2 \pi \omega L$
When frequency of a.c. source is increased, inductive reactance increases while capacitive reactance decreases. Also, Current $\propto \frac{1}{\text { Impedance }}$
So, current in inductive circuit decreases and in capacitive circuit increases on increasing the frequency of a.c. source.

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