Question

One coulomb is-
1. the measure of electric charge
2. equal to the amount of charge from a current of one ampere flowing for one second
3. equal to the charge of 6.24 × 1018 electrons
4. All of the above

Answer 1

Correct Answer - Option 4 : All of the above

The correct answer is option 4) i.e. All of the above 

CONCEPT:

• Electric charge is a fundamental property of matter that causes the matter to experience a force when kept in electric and magnetic fields.
  • There are two types of charges possessed by matter - negative charge and positive charge.
  • The matter that is neither positive nor negative is said to be neutral.
  • The electric charge of the matter comes from the charge carried by electrons and protons at the atomic level.
  • The SI unit of electric charge is coulomb (C).

EXPLANATION:

• Electric charge is measured in the SI unit coulomb (C).
• Electric current (I) is defined as the charge flowing per unit time.

\(I = \frac{q}{t}\)

Where I is current, q is the charge and t is the time.

So, 1 coulomb is the charge from a current of 1 A flowing in 1 s.

• Charge of an electron = 1.6 × 10^-19 C

Number of electrons in 1 C = \(\frac{1 \:C}{1.6\; \times \;10^{-19}\: C} = 6.24\; \times \;10^{18}\)

Hence, all the given options are correct.