Advertisements
Advertisements
प्रश्न
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
विकल्प
of the inductor increases
of the resistor increases
of the capacitor increases
of the circuit increases
Advertisements
उत्तर
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
संबंधित प्रश्न
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
An inductor-coil, a capacitor and an AC source of rms voltage 24 V are connected in series. When the frequency of the source is varied, a maximum rms current of 6.0 A is observed. If this inductor coil is connected to a battery of emf 12 V and internal resistance 4.0 Ω, what will be the current?
A 44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit.
A coil of inductance 0.50 H and resistance 100 Ω is connected to a 240 V, 50 Hz ac supply.
(a) What is the maximum current in the coil?
(b) What is the time lag between the voltage maximum and the current maximum?
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?
A 100 µF capacitor in series with a 40 Ω resistance is connected to a 110 V, 60 Hz supply.
(a) What is the maximum current in the circuit?
(b) What is the time lag between the current maximum and the voltage maximum?
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.
If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will ______.
A current of 4A flows in a coil when connected to a 12V dc source. If the same coil is connected to a 12V, 50 rad/s a.c. source, a current of 2.4A flows in the circuit. Determine the inductance of the coil.
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.
The magnetic energy stored in an inductor of inductance 4 µH carrying a current of 2 A is ______.
The inductive reactance XL of a purely inductive circuit is given by ______.
What alternating voltage is applied across the pure inductor of inductance \[L\]?
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 \[f=50\,\mathrm{Hz}\]?
How do transformer cores operate to enable efficient transfer of electrical energy between coils?
Which principle transfers electrical energy wirelessly between coils in wireless charging?
