Question

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 ______.

विकल्प

• increase in first circuit and decrease in second.

• increase in both circuits.

• decrease in both circuits.

• decreases in first circuit and increases in second.

Answer 1

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 decreases in first circuit and increases in second.

Explanation:

For inductor,

`"I"  alpha 1/"X"_"L"  alpha 1/"f"`

Hence, as frequency increases, current decreases. For capacitor,

`"I"  alpha 1/"X"_"c" alpha  "f"`

Hence, as frequency increases, current increases.