MCQ Detailed View

The Coulomb (symbol: C) is the SI unit of electric charge in physics. It is named after the French physicist Charles-Augustin de Coulomb, who studied the laws of electrostatic force between charged particles in the 18th century. Electric charge is a fundamental property of matter that causes particles to experience a force when placed in an electromagnetic field.

One Coulomb is defined as the amount of electric charge transported by a constant current of one ampere in one second. Mathematically,
1 C = 1 A × 1 s
This means if an electric current of one ampere flows through a wire for one second, it carries a charge of one Coulomb.

Electric charge is usually carried by elementary particles such as electrons and protons. An electron has a very small negative charge of approximately −1.6 × 10⁻¹⁹ Coulombs, while a proton has an equal but positive charge.

Coulomb is not a unit of velocity, temperature, or mass.

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  Velocity is measured in meters per second (m/s).

  
  


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  Temperature is measured in Kelvin (K) or degrees Celsius.

  
  


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  Mass is measured in kilograms (kg).

  
  

In this multiple-choice question, none of the listed options directly mention electric charge, which is the correct physical quantity measured in Coulombs. Therefore, the most accurate choice among the provided options is “None of these”.

Understanding the Coulomb as a unit of electric charge is important in the study of electric circuits, electrostatics, and electromagnetism. It helps in quantifying the flow of electricity, designing electrical devices, and explaining how charges interact with each other under electric and magnetic forces.