Question 259: AC fundamentals

Question

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

Accepted Answer

Inductive reactance $\mathrm{X}_{\mathrm{L}}=\omega \mathrm{L}=2 \pi \mathrm{fL}$
$	herefore \quad \mathrm{X}_{\mathrm{L}} \propto \mathrm{f}$
Capacitive reactance $\mathrm{X}_{\mathrm{C}}=\frac{1}{\omega_{\mathrm{C}}}=\frac{1}{2 \pi \mathrm{fC}}$
$	herefore \quad \mathrm{X}_{\mathrm{C}} \propto \frac{1}{\mathrm{f}}$
As frequency increases inductive reactance will increase and current will decrease. On the other hand capacitive reactance will decrease and the current will increase.

Answer

increase in the first circuit and decrease in second.

Answer

increase in both circuits.

Answer

decrease in both circuits.

Answer

decrease in first circuit and increase in second.

AC fundamentals

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

Choose the correct answer: