Coulomb's Law - 2nd period

Front

What is Coulomb's Law?

Back

Coulomb's Law states that the electrostatic force between two charged objects is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.

Front

What is the formula for calculating the electrostatic force using Coulomb's Law?

Back

F = k * |q1 * q2| / r^2, where F is the force, k is Coulomb's constant (8.99 x 10^9 N m²/C²), q1 and q2 are the charges, and r is the distance between the charges.

Front

What is Coulomb's constant?

Back

Coulomb's constant (k) is approximately 8.99 x 10^9 N m²/C² and is used in Coulomb's Law to calculate the electrostatic force between two charges.

Front

How does distance affect the electrostatic force between two charges?

Back

The electrostatic force decreases with the square of the distance between the charges; as the distance increases, the force decreases rapidly.

Front

What happens to the electrostatic force if the charges are doubled?

Back

If both charges are doubled, the electrostatic force increases by a factor of four, since force is proportional to the product of the charges.

Front

What is the significance of the sign of the electrostatic force?

Back

The sign indicates the nature of the force: a positive force indicates repulsion (like charges), while a negative force indicates attraction (opposite charges).

Front

Calculate the electrostatic force between a +5 C and a +8 C charge that are 12 m apart.

Back

F = (8.99 x 10^9 N m²/C²) * (5 C * 8 C) / (12 m)² = 2.5 x 10^9 N.

Front

What is the electrostatic force between a +3.0 x 10^-5 C charge and a +6.0 x 10^-6 C charge that are 0.30 m apart?

Back

F = (8.99 x 10^9 N m²/C²) * (3.0 x 10^-5 C * 6.0 x 10^-6 C) / (0.30 m)² = 1.8 x 10^1 N.

Front

If two charges of +4 C and -7 C are 200 m apart, what is the force between them?

Back

F = (8.99 x 10^9 N m²/C²) * (4 C * -7 C) / (200 m)² = -6.3 x 10^6 N.

Front

What is the electrostatic force between a +5 C and an -8 C charge that are 8 m apart?

Back

F = (8.99 x 10^9 N m²/C²) * (5 C * -8 C) / (8 m)² = 5.625 x 10^9 N.