Question

Name the physical quantity of which the unit is coulomb:
A. capacitance
B. charge
C. current
D. inductance

Answer 1

Remind the units of all the physical quantities given in the options. Also check the units of the quantities of all the physical quantities which are named after the names of different scientists.

Complete step by step answer:
The capacitance is the property of the device named capacitor. The capacitance of a capacitor is defined as the property of the capacitor to store the energy in the form of electrical charge.
The capacitance is the ratio of the charge to potential difference.
Therefore, the unit of capacitance in the base units is ${{\text{A}}^2} \cdot {{\text{s}}^4} \cdot {\text{k}}{{\text{g}}^{ - 1}} \cdot {{\text{m}}^{ - 2}}$.
The unit of capacitance is farad named after the scientist Michael Faraday.
Hence, coulomb is not the unit of capacitance.
Hence, the option A is incorrect.

The current is defined as the flow of electrons in a conductor.
According to Ohm’s law, the current is the ratio of the potential difference to the resistance.
Hence, the unit of current is voltage per ohm.
The unit of the current is Ampere named after the scientist Andre-Marie Ampere.
Hence, coulomb is not the unit of current.
Hence, the option C is incorrect.

The inductance is defined as the property of the conductor to oppose the change in current flowing through it.
The basic unit of inductance is ${\text{kg}} \cdot {{\text{m}}^2} \cdot {{\text{s}}^{ - 2}} \cdot {{\text{A}}^{ - 2}}$.
The unit of the current is henry named after the scientist Joseph Henry.
Hence, coulomb is not the unit of inductance.
Hence, the option D is incorrect.

The property of the matter that causes the matter placed in an electromagnetic field to experience a force.
The current is the product of current and time.
The basic unit of inductance is ${\text{A}} \cdot {\text{s}}$.
The unit of the current is coulomb named after the scientist Charles-Augustin de Coulomb.
Hence, coulomb is not the unit of charge.

So, the correct answer is “Option B”.

Note:
The unit of the electric current ampere is named after the scientist Andre-Marie Ampere but it is the basic unit of the current.
The current is the product of current and time.