The SI unit of which fundamental physical quantity is named in the honour of Charles Augustin Coulomb?

Question

Examoogle · Accepted Answer

The correct answer is Option D: Electric charge. The SI unit of electric charge is the coulomb (C), named after the French physicist Charles Augustin de Coulomb. One coulomb is defined as the amount of electricity transported by a current of one ampere in one second.

Step-by-Step Solution & Concepts:
The SI unit of electric charge is the coulomb (C), named after the French physicist Charles Augustin de Coulomb. One coulomb is defined as the amount of electricity transported by a current of one ampere in one second.

Working Principle: Electric charge is a fundamental physical property of matter that causes it to experience a force when placed in an electromagnetic field. Coulomb's Law quantifies the electrostatic force between two point charges, given by $F = k_e \frac{|q_1 q_2|}{r^2}$, where $F$ is the force, $q$ represents the charges, and $r$ is the separation distance. This law establishes the relationship between charge, distance, and force.

Key Formulas: $Q = I 	imes t$ — where $Q$ is charge in Coulombs, $I$ is current in Amperes, and $t$ is time in seconds.; $F = k_e \frac{|q_1 q_2|}{r^2}$ — Coulomb's Law describing electrostatic force.

Key Points: One coulomb is equivalent to approximately $6.242 	imes 10^{18}$ elementary charges (the charge of a proton).; The elementary charge of a single electron is approximately $1.602 	imes 10^{-19} 	ext{ C}$.; Coulomb is a derived SI unit, as it is defined in terms of the base units ampere and second.

Applications: Quantifying static electricity accumulation on surfaces.; Measuring the total charge transferred during a lightning strike.

Additional Info: Option A (Electric field) is measured in $	ext{N/C}$ or $	ext{V/m}$.. Option B (Electric power) is measured in Watts (W).. Option C (Electric current density) is measured in $	ext{A/m}^2$.

Answer: D is correct — The SI unit of electric charge is the coulomb, named in honour of Charles Augustin de Coulomb.

Exam Tip: Always distinguish between base SI units (like Ampere) and derived SI units (like Coulomb). Coulomb is derived from the base units: $1 	ext{ C} = 1 	ext{ A} \cdot 	ext{ s}$.

Examoogle · Answer

Option A: Electric field

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Option B: Electric power

Examoogle · Answer

Option C: Electric current density

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