Question

Capacitive reactance Xc increases with _________ in frequency of ac and current in the capacitive ac circuit _________ the ac voltage.

Answer 1

Explanation:

first -decrease............ second – increase

Answer 2

Answer: Capacitive reactance $X_{c}$  increases with a decrease in the frequency of alternating current and current in the capacitive ac circuit increases the ac voltage.

Explanation:

We know that  $X_{c}$ = $\frac{1}{cw}$

Where,

$X_{c}$  = capacitive reactance

C = capacitance of the capacitor

ω = angular frequency of the alternating current

ω = 2πf

where f is the frequency of the alternating current.

=> $X_{c}$ = 1 / 2πf --------------------------(1)

From eq(1) we can say that   $X_{c}$ and f are inversely proportional.

Therefore, capacitive reactance $X_{c}$  increases with decrease in frequency of alternating current.

And we know that V =I R      (Ohm's Law)

Therefore, current in the capacitive ac circuit increases the ac voltage.