Question

CGS unit of magnetic field intensity is
(A). Tesla
(B). Gauss
(C). Weber
(D). None of these

Answer 1

Hint: Magnetic field is a type of field that passes through space and which makes a magnetic force move electric charges and magnetic dipoles. Magnetic field strength is a physical quantity that is used as one of the basic measures of the intensity of the magnetic field. Magnetic field strength or magnetic field intensity can be measured in different units, SI unit and CGS unit, which we have to study about.

Complete step-by-step answer:
Magnetic field is a vector field, or pseudo vector field, that describes the magnetic influence or impact of electric charges in relative motion with each other and effect of magnetized materials. A charge moving parallel to a current of other charges experiences a force perpendicular to its own velocity. We can say that the magnetic field is the area around a magnet in which there is a presence of magnetic force. Magnetic field is a type of field that passes through space and generates a magnetic force resulting in the movement of electric charges and magnetic dipoles placed in that field. Magnetic field lines are used to express the direction of magnetic field vectors at a particular space.

Magnetic field strength or magnetic field intensity is expressed as the ratio of the magneto motive force which is required to create a certain flux density within a certain material per unit length of that material. The magnetic flux refers to the total number of magnetic field lines that penetrate a particular area.
Magnetic field strength is a physical quantity that is used as one of the basic measures of the intensity of the magnetic field. The unit of magnetic field strength happens to be ampere per meter. Magnetic field intensity is a quantitative measure of strength or the weakness of the magnetic field. It can be defined as the amount of force which a unit north pole of one-weber strength experiences at a specific point in the magnetic field.
The International System (SI) unit of magnetic field intensity is Tesla $\left( T \right)$.
$T=Kg{{\sec }^{-2}}{{A}^{-1}}$
One Tesla is defined as the magnetic field intensity that can generate one newton of force per ampere of current per meter of the conductor.
The Gauss $\left( Gs\text{ or }G \right)$ is the CGS unit for the measurement of magnetic field $B$, which is also called the magnetic flux density or the magnetic induction.
One Gauss is expressed as one Maxwell per square centimetre.
Relation between SI and CGS unit of magnetic field intensity:
$\begin{align}
  & 1\text{ Gauss = }1\times {{10}^{-4}}\text{ Tesla} \\
 & \text{Or,} \\
 & 1\text{ Tesla = }10,000\text{ Gauss} \\
\end{align}$
The CGS unit of magnetic field intensity is Gauss.
Hence, the correct option is B.

Note: Students should not get confused between magnetic field and magnetic field strength. The magnetic field is the area around a magnet in which there is presence of magnetic force while the magnetic field strength is a quantitative measure of strength or the weakness of the magnetic field present in an area.