Question

The physical quantity which is measured in the unit of $Wb{A^{ - 1}}$ is
(A) Self-inductance
(B) Mutual inductance
(C) Magnetic flux
(D) Both (A) and (B)

Answer 1

Hint Inductor is a two-terminal passive electrical component that stores the energy in the form of the magnetic field which is obtained when the electric current is flowing through it. Inductance is a characteristic property of an inductor that can be described as the ratio of the induced voltage or emf to the rate of change of electric current that is causing it. Its SI unit is Henry $(H)$ .

Complete Step by step answer
Now we know that inductance can be of two types. They are Self-induction and mutual inductance.
Self-induction can be defined as the induction of voltage in a current-carrying wire observed when the current in the wire is changing itself. In other words, self-induction is a property that is also a form of electromagnetic induction. A self-inductance magnetic field which is created by the changing current in the circuit itself includes a voltage in the same circuit. Its unit is Henry $(H)$ and weber per ampere $Wb{A^{ - 1}}$.

Now the mutual inductance is observed when two current coils are placed together. A mutual inductance magnetic field is generated in one coil due to flowing current through it. This magnetic field when interacts with another coil induces the voltage or emf in the adjacent coil. Its unit is unit Henry $(H)$ and weber per ampere $Wb{A^{ - 1}}$.
But if we talk about the magnetic flux which is a measure of the total magnetic field which passes through an area given that means the magnetic flux is the product of all the magnetic field lines with the perpendicular area through with it passing. Its SI unit is Weber$(Wb)$.
Now as we have seen above that $Wb{A^{ - 1}}$ is the unit of self-induction as well as mutual inductance while the unit of magnetic flux is only Weber $(Wb)$.

Hence the option (D) is the correct answer.

Note Electrical components can be of two types: passive or active. The term passive electrical components mean those which do not require an external power source for their working while active components on the other hand active components rely on the external power source for their function such as transistors. An example of a passive component is an inductor, resistors.