Question

The SI unit of circuit element inductance is:
1. Ohm
2. Volt
3. Faraday
4. Henry

Answer 1

Correct Answer - Option 4 : Henry

CONCEPT:

• Induction: It is the magnetic field that is proportional to the rate of change of the magnetic field.
  • This definition of induction holds for a conductor. Induction is also known as inductance.
  • L is used to represent the inductance and Henry is the SI unit of inductance.
  • 1 Henry is defined as the amount of inductance required to produce an emf of 1 volt in a conductor when the current change in the conductor is at the rate of 1 Ampere per second.
  • Following are the factors that affect the inductance:
  1. The number of turns of the wire used in the inductor.
  2. The material used in the core.
  3. The shape of the core.
  • Electromagnetic Induction: The law was given by Faraday which states that by varying the magnetic flux electromotive force is induced in the circuit.
  • Inductance: It can be defined as the electromotive force generated to oppose the change in current at a particular time duration.

 According to Faraday’s Law:

\(E.M.F = -L\frac{\Delta I}{\Delta t}\)

\(Unit = \frac{Volts \times second}{Ampere} = Henry\)

EXPLANATION:

• From the above discussion, it's clear that the unit of inductance is Henry.

The correct option is 24.

• Unit of capacitance:  Farad
• Unit of magnetic intensity: W/m2
• Unit of Frequency: Hertz