Advertisements
Advertisements
Question
What is the ratio of inductive and capacitive reactance in an ac circuit?
Options
ω2LC
LC2
`(LC)/omega^2`
`omega^2L`
Advertisements
Solution
ω2LC
Explanation:
Inductive reactance, XL = ωL
Capacitive reactance, `X_C = 1/(omegaC)`
Therefore, `X_L/X_C = (omegaL)/((1"/"omegaC))`
= `omega^2LC`
APPEARS IN
RELATED QUESTIONS
The magnetic field energy in an inductor changes from maximum to minimum value in 5.0 ms when connected to an AC source. The frequency of the source is
An inductor coil of some resistance is connected to an AC source. Which of the following quantities have zero average value over a cycle?
(a) Current
(b) Induced emf in the inductor
(c) Joule heat
(d) Magnetic energy stored in the inductor
A 44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit.
Obtain if the circuit is connected to a high-frequency supply (240 V, 10 kHz). Hence, explain the statement that at very high frequency, an inductor in a circuit nearly amounts to an open circuit. How does an inductor behave in a dc circuit after the steady state?
Obtain if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state.
Alternating current is so called because _______.
Average power supplied to an inductor over one complete cycle is ______.
If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will ______.
Explain why the reactance offered by an inductor increases with increasing frequency of an alternating voltage.
An electrical device draws 2kW power from AC mains (voltage 223V (rms) = `sqrt(50,000)` V). The current differs (lags) in phase by `phi(tan phi = (-3)/4)` as compared to voltage. Find (i) R, (ii) XC – XL, and (iii) IM. Another device has twice the values for R, XC and XL. How are the answers affected?
