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WorksheetsElectric Force - Coulomb's Law
Total questions: 15
Worksheet time: 8mins
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.
Explain the concept of superposition of electric forces.
Superposition of electric forces implies that the total electric force on a charge is always equal to the largest individual electric force acting on it.
The total electric force acting on a charge is the vector sum of all the individual electric forces acting on that charge due to other charges in the system.
The concept of superposition of electric forces states that electric forces are always additive and never cancel each other out.
Superposition of electric forces refers to the cancellation of all electric forces in a system.
What is the significance of the electric field in understanding electric forces?
Electric fields are only relevant in magnetic interactions
Electric forces are solely determined by the charge of the particles
The electric field has no impact on understanding electric forces
The electric field helps quantify and predict the interactions between charged particles.
How does the electric force between two charges change if the magnitude of one charge is doubled?
The electric force will quadruple.
The electric force will remain the same.
The electric force will be halved.
The electric force between the charges will double.
Discuss the similarities and differences between gravitational force and electric force.
Gravitational force and electric force are both attractive forces
Electric force follows a linear law
Gravitational force and electric force are similar in following an inverse square law but differ in the properties they depend on and whether they are attractive or repulsive.
Gravitational force depends on the charge of the objects involved
Calculate the electric force between two charges of +3 μC and -5 μC separated by a distance of 2 meters.
The electric force between the charges is 0 N.
The electric force between the charges is -1.8 x 10^-3 N.
The electric force between the charges is 2.5 x 10^-3 N.
The electric force between the charges is 1.35 x 10^-3 N.
