Question

Inductive reactance of a coil is expressed in
A. Ampere
B. Ohm
C. Volt
D. Weber

Answer 1

Hint: Inductive reactance is the opposition offered by an inductor in an alternating current circuit to the flow of alternating current. Unlike resistance, Inductive reactance can vary with the frequency of the input voltage. In an inductive circuit, the current lags the voltage by a phase difference of ninety degrees.

Complete step by step answer:
Reactance is described as the opposition offered by a capacitor or an inductor, or both, in a circuit to the flow of the Alternating current in the circuit. The reactance is quite similar to resistance but reactance varies with the frequency of the alternating voltage source.
An inductor is simply a coil of wire. When current passes through the inductor coil, an electrical field is generated; the field has actually been induced. The bigger the coil or the greater the number of turns in the coil, the greater will be the induced electric field. This phenomenon of the generation of the induced electric field is known as inductance.

Inductive reactance is the name given to the opposition by an inductor to a changing current flow in the circuit. This impedance value is measured in ohms, just like the resistance. The inductive reactance is represented by ${{X}_{L}}$ and measured in ohms $\left( \Omega \right)$.
The formula for calculating the inductive reactance of a coil is given by:
${{X}_{L}}=2\pi fL$
Where,
${{X}_{L}}$ is the inductive reactance in ohms
$f$ is the frequency of the alternating current in hertz
$L$ is the inductance of the coil in henry
The inductive reactance of a coil is expressed in Ohms.

So, the correct answer is “Option B”.

Note: According to the formula of Inductive reactance, the value of inductive reactance is proportional to the frequency of the input voltage and the inductance of the coil. Inductive reactance is mostly low for lower frequency and high for higher frequency input voltages. The value of inductive reactance is negligible for the direct current input voltage.