Advertisements
Advertisements
Question
An 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
Options
of the inductor increases
of the resistor increases
of the capacitor increases
of the circuit increases
Advertisements
Solution
of the inductor increases
The reactance of an inductor is given by,
`X_L = omegaL`
And the reactance of a capacitor is given by,
`Xc = 1/(omegaC)`
Here, ω = 2πf , where f is the frequency of the source. So, when f increases, ω increases.
∴ XL will increase and XC will decrease.
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.
An applied voltage signal consists of a superposition of a dc voltage and an ac voltage of high frequency. The circuit consists of an inductor and a capacitor in series. Show that the dc signal will appear across C and the ac signal across L.
In a circuit containing resistance only, voltage and current are ______.
If circuit containing inductance only, the current ______.
If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will ______.
An inductive circuit contains resistance of 10 ohms and an inductance of 2 henry. If an A.C. voltage of 120 Volts and frequency 60 Hz is applied to this circuit, the current would be nearly ______.
Explain why the reactance offered by an inductor increases with increasing frequency of an alternating voltage.
An ac voltage V = V0 sin ωt is applied across a pure inductor of inductance L. Find an expression for the current i, flowing in the circuit and show mathematically that the current flowing through it lags behind the applied voltage by a phase angle of `π/2`. Also draw graphs of V and i versus ωt for the circuit.
What is the ratio of inductive and capacitive reactance in an ac circuit?
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance ______.
A 2 mH inductor is connected to 220 V, 50 Hz AC (X1) and then to DC (X2). Find X1 and X2.
Which equation results from applying Kirchhoff's Voltage Law to the pure inductor?
With \[C=0\], which expression gives the current before conversion to sine form?
Which expression defines inductive reactance in terms of angular frequency and inductance?
How does inductive reactance relate voltage amplitude to current amplitude?
What is the inductive reactance of a pure inductor with \[L=25.0\,\mathrm{mH}\] at \[f=50\,\mathrm{Hz}\]?
What is the rms current when \[V_{\mathrm{rms}}=220\,\mathrm{V}\] and \[X_L\approx7.85\,\Omega\]?
