Question

The unit of current in CGS system is:
$\begin{align}
  & \text{A}\text{. }10A \\
 & \text{B}\text{. }\dfrac{1}{10}A \\
 & \text{C}\text{. }\dfrac{1}{100}A \\
 & \text{D}\text{. }\dfrac{1}{1000}A \\
\end{align}$

Answer 1

Hint: Electric current is a measurement of the quantity of electric charge passing through a point in a circuit per unit time. The direction of the electric current in the electric circuits is taken as the direction of positive charge flow. The magnitude of electric current can be measured in different SI and CGS units. The SI unit of current is ampere and the CGS unit is biot, also called an abampere that we will study about and find the relation between ampere and abampere.

Complete step-by-step answer:
Electric current is described as the movement of electric charge carriers, such as subatomic charged particles, for example: electrons carrying negative charge, protons carrying positive charge, ions that are those atoms which have either gained or lost one or more electrons, or holes which are electron deficiencies and can be considered as positive particles.
Electric current in a wire is due to the charge carriers being electrons, and is a measure of the quantity of charge passing any point of the wire per unit of time. In case of alternating current, the motion of the electric charges is periodically reversed while in direct current it is not.
Current is usually denoted by the symbol $I$. Ohm’s law basically relates the current flowing through a conductor to the voltage $V$ and the resistance $R$.
Expression for Ohm’s law:
$V=IR$
An alternative statement of Ohm’s law:
$I=\dfrac{V}{R}$
Where,
$I$ is the electric current
$V$ is the voltage
$R$ is the resistance of the material
The SI unit of current is ampere, which measures the flow of electric charge across a surface, or in a circuit, at the rate of one coulomb per second.
The CGS unit of the electric current is the biot, symbolised as $\text{Bi}$.
The emu unit of electric current, biot $\left( \text{Bi} \right)$ , also called as abampere or emu current, is therefore as follows:
The Biot is defined as that constant current which, if maintained between two straight parallel conductors of infinite length, of negligible circular cross-section, and placed one centimetre apart in vacuum, would produce between these parallel conductors a force whose magnitude is equal to two dynes per centimetre of length.
1 Biot is equal to 10 Amperes in the SI system.

So, the correct answer is “Option A”.

Note: The direction of the electric current in the electric circuits is taken as the direction of positive charge carriers, the direction opposite to the actual electron drift. When so defined the current is known as conventional current. The SI unit of electric current is the ampere, which is the flow of electric charge across a surface or in an electric circuit at the rate of one coulomb per second. Electric current is measured using an electronic device known as ammeter.
Ampere is the SI base unit for the measurement of electric current. The CGS unit of the electric current is the biot, symbolised as: $\text{Bi}$.