Question

Gauss is the unit of
(A). B
(B). H
(C). M
(D). I

Answer 1

Hint: You can start the solution by describing what each of the four given symbols represents (i.e. magnetic flux intensity, inductance, current, and magnification). Also, remember the common units for them. Then choose what Gauss represents to reach the solution.

Complete step-by-step answer:
Let’s start by explaining all the options given to us in the problem.
B – It represents the magnetic flux density. You may know that the magnetic field is made up of multiple magnetic field lines. The number of magnetic field lines passing through the unit area is called the magnetic flux density. Some units of magnetic flux density include tesla, weber, and gauss.
H –It represents both inductance and magnetic field intensity. But here we will consider that H refers to inductance, the reason will be described later on in the solution. Inductance is a property of a material to resist the change in the rate of flow of current through the material. The unit of inductance is henry.
I – It represents current. Current is the amount of charge that flows through a circuit in unit time. The unit of current is Ampere.
M – It usually refers to magnification. Magnification refers to how large or small an object appears relative to its original size. Magnification has no unit (it is unitless quantity)
Now, as you may have noticed, Gauss is the unit of magnetic flux density (B).
But when we were discussing H we ignored the possibility that it could represent magnetic field intensity because Gauss is also the unit of magnetic field intensity and we had to select only one option from the given option, therefore we considered H as inductance.
Hence, option A is the correct choice.

Note: If the problem had stated that there are multiple correct options, then you could have considered H as magnetic field intensity and not as inductance. As for why we did not consider B to be something else aside from magnetic flux density, it was because in physics B only represents magnetic flux density and nothing else.