Electric Force - Coulomb's Law

What is Coulomb's Law?

• Coulomb's Law is related to gravitational forces.

• Coulomb's Law only applies to magnetic fields.

• Coulomb's Law states that opposite charges repel each other.

• Coulomb's Law describes the electrostatic force between charged objects.

State the mathematical expression for Coulomb's Law.

• F = k * q1 * q2 / r^2

• F = k * q1 / r^2

• F = k * q2 / r^2

• F = k * |q1 * q2| / r^2

What are the SI units of charge and distance in Coulomb's Law?

• Ohm (Ω) and inch (in)

• Coulomb (C) and meter (m)

• Volt (V) and centimeter (cm)

• Ampere (A) and kilometer (km)

Explain the concept of electric force according to Coulomb's Law.

• The electric force is directly proportional to the distance between charged objects.

• Coulomb's Law only applies to neutral objects.

• The electric force is inversely proportional to the charges of the objects.

• The concept of electric force according to Coulomb's Law states that the force between two charged objects is proportional to the product of their charges and inversely proportional to the square of the distance between them.

How does the magnitude of the electric force between two charges change with an increase in distance?

• Reverses direction

• Increases

• Remains constant

• Decreases

If two charges are brought closer together, what happens to the electric force between them?

• Reverses direction

• Remains constant

• Decreases

• Increases

What is the proportionality constant in Coulomb's Law?

• 9.80665 N m/kg

• 6.6743 x 10^-11 N m^2/kg^2

• 3.1416 x 10^7 N m^2/C^2

• 8.9875 x 10^9 N m^2/C^2

Describe the direction of the electric force between like and unlike charges.

• The electric force between like and unlike charges is neutral.

• The electric force between like charges is attractive.

• The electric force between unlike charges is repulsive.

• The electric force between like charges is repulsive, and between unlike charges is attractive.

What is the net force acting on a positive charge placed in an electric field?

• In the direction of the electric field lines

• No force acting on it

• Opposite to the electric field lines

• Perpendicular to the electric field lines

How does the presence of a dielectric material affect the electric force between charges?

• The electric force between charges is reduced.

• The electric force between charges becomes repulsive.

• The electric force between charges remains the same.

• The electric force between charges is increased.