Coulomb | MCQs

Explanation

The SI unit of electric charge is the coulomb, represented by the symbol C.

One coulomb is the amount of charge that passes through a conductor carrying one ampere of current for one second.

It's also equal to the charge of about 6.24 quintillion electrons or protons.

Explanation

According to Coulomb's Law, the force between two charges is inversely proportional to the square of the distance between them.

If the distance is halved, the force becomes four times stronger.

Explanation

Explanation

According to Coulomb’s Law, force is inversely proportional to the square of distance: F∝ 1/r².

So, if distance is doubled, force becomes 1/(2)² = 1/2.

Explanation

Explanation

Explanation

One Coulomb (C) is the unit of electric charge and is defined as the amount of charge transported by a steady current of 1 Ampere (A) flowing for 1 second.

Mathematically: 

1Coulomb=1Ampere×1second

This means that if a current of 1 Ampere flows through a conductor for 1 second, the total charge transported is 1 Coulomb.

Explanation

The electrostatic force between two electrons is F Newton, and since protons have the same charge magnitude as electrons (but opposite sign).

The force between two protons at the same distance is also F Newton.

Explanation

Coulomb's Law most closely resembles Newton's Law of Gravitation.

• Both laws deal with forces between objects
• Both forces decrease with distance (inverse-square law)
• Mathematical formulas are similar in structure

F = k × (q1 × q2) / r^2 (Coulomb's Law)

F = G × (m1 × m2) / r^2 (Newton's Law of Gravitation)

Explanation

The magnitude of the force between two unit positive charges (each with a charge of 1 Coulomb) separated by a distance of 1 meter in a vacuum is given by Coulomb's Law:

F = k × (q1 × q2) / r^2

where:

F = force (in Newtons)

k = Coulomb's constant (approximately 8.98755 × 10^9 N m^2 C^2)

q1 and q2 are the charges (in Coulombs)

r is the distance between the charges (in meters)

Plugging in the values, we get:

F ≈ (8.98755 × 10^9 N m^2 C^2) × (1 C × 1 C) / (1 m)^2

F ≈ 8.98755 × 10^9 N

F ≈ 9 × 10^9 N (approximately)

Since 1 Newton is equal to 10^9 N (by definition), we can simplify the answer to:

F ≈ 1 N (approximately)