NEET-XII-Physics
39: Alternating Current
- #1An inductor, a resistance and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance
(a) of the inductor increases
(b) of the resistor increases
(c) of the capacitor increases
(d) of the circuit increasesdigAnsr: aAns : (a) of the inductor increases
The reactance of an inductor is given by,
`` {X}_{L}=\omega L``
And the reactance of a capacitor is given by,
`` {X}_{C}=\frac{1}{\omega C}``
Here, ω = 2πf , where f is the frequency of the source. So, when f increases, ω increases.
∴ XL will increase and XC will decrease.
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