# Which of the following is a unit of electric charge?

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Which of the following is a unit of electric charge?
1. coulomb
3. Ampere-second
4. All of the above

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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 SI unit of electric charge is coulomb (C).
• Electric current is defined as the charge flowing per unit time.

It is given by:

$I = \frac{q}{t}$

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

EXPLANATION:

• The SI unit of electric charge is the coulomb.

Electric charge, q = Current (I) × time (t).

• The SI unit of current is ampere and that of time is second. Hence, ampere-second also denotes the electric charge.
• Capacitance is the ability of a capacitor to store electrical charge in it.

The capacitance (C) is related to the electrical charge Q and voltage V across them as:

$C =\frac{Q}{V}$

Therefore, Electrical charge (Q) = CV.

• The SI unit of capacitance is faraday and that of voltage is volt. Thus, faraday-volt is also a unit of electrical charge.
• Thus, the given all options are units of electrical charge.