List of top Physics Questions on Reactance

An alternating voltage \(V=200\sqrt{2}\sin (100t)\) volt is connected to \(1\mu F\) capacitor through ammeter (AC). The reading of ammeter is (in mA)

Same current is flowing in two AC circuits. First contains only inductance and second contains only capacitance. If frequency of AC is increased for both, the current will

Which one of the following graph represents the correct variation of inductive reactance (\(X_{L}\)) with angular frequency (\(\omega\))?

An alternating voltage \(V=200\sqrt{2}\sin (100t)\) volt is connected to \(1\ \mu F\) capacitor through a.c. ammeter. The reading of ammeter is

In an a.c. circuit, if the frequency is doubled, what happens to the capacitive reactance (\(X_{c}\)) and the current (\(I\))?

An inductance of negligible resistance, whose reactance is \(120\) \(\Omega\) at \(200\) Hz is connected to a \(240\) V, \(60\) Hz Power line. The current in the inductor is

A capacitor of \(10\mu F\) has reactance \(2\times 10^{-3}\Omega\). The corresponding frequency is

Consider the statements on capacitive reactance.
Statement I: As capacitance increases, the capacitive reactance also increases.
Statement II: The capacitive reactance is independent of the source frequency.

An alternating voltage given as, \(E=100\sqrt{2}\sin (100t)\) volt is applied to a capacitor of \(1\ \mu \text{F}\). The current reading of the ammeter will be equal to

An a.c. source is connected to a capacitor 'C'. Due to increase in its operating frequency

A series combination of resistor 'R' and capacitor 'C' is connected to an a.c. source of angular frequency '\(ω\)'. Keeping the voltage same, if the frequency is changed to \((\frac{ω}{3})\) the current becomes half of the original current. Then the ratio of capacitive reactance and resistance is

In LCR circuit, at a particular angular frequency the capacitive reactance and inductive reactance is same. If the angular frequency is doubled, the ratio of the reactance of the capacitor to that of the inductor will be

Determine the frequency for which a \(10\,μ\text{F}\) capacitor has a reactance of \(2\times 10^{-3}\,\Omega\).

A coil has inductive reactance \(3\) H. The ratio of its reactance when it is first connected to an a.c. source and then to d.c. source is

An electronic device operates at $2\text{ MHz}$. The oscillating circuit has an inductance $20\times10^{-5}\text{ H}$. What is the capacitive reactance of the resonant circuit?

An inductor of 200 \(\mu\)H is connected to an alternating source of frequency 50 Hz. Then the inductive reactance is:

The inductive reactance of a coil is \(R\ \Omega\). If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new inductive reactance will be

An electric motor when loaded has an effective resistance of $30\,\Omega$ and an inductive reactance of $40\,\Omega$. If the motor is powered by a source with maximum voltage of $420\,V$, the maximum current is

The alternating voltage and current in an electric circuit are respectively given by \(E = 100\sin 100\pi t\), \(I = 5\sin 100\pi t\). The reactance of the circuit will be

The impedance of a circuit consists of 3 \( \Omega \) resistance and 4 \( \Omega \) reactance. The power factor of the circuit is:

In an a.c. circuit with phase voltage V and current I, the power dissipated is