Electric Force
What happens to the strength of the electric force between two charges when the distance between them increases?
The electric force becomes weaker.
What happens when two like magnetic poles are brought near each other?
They repel.
What is created when an electric current flows through a wire?
A magnetic field.
What device uses electric and magnetic interactions to convert electrical energy into mechanical energy?
An electric motor.
What type of charge interaction causes objects to attract each other?
Opposite charges attract.
Which materials are most likely to be affected by a magnetic force?
Iron, nickel, and cobalt.
What is the main difference between a permanent magnet and an electromagnet?
An electromagnet requires an electric current to produce a magnetic field, while a permanent magnet does not.
What device converts mechanical energy into electrical energy using electromagnetic induction?
A generator.
If the charge on one object doubles, what happens to the electric force between the two objects?
The electric force doubles.
What is the area around a magnet where magnetic forces can be observed?
Magnetic field.
Name one way to make an electromagnet stronger.
Increase the number of wire coils, increase the electric current, or use a stronger core material like iron.
What happens when a conductor moves through a magnetic field?
An electric current is induced in the conductor.
What is the invisible field around a charged object that exerts a force on other charged objects?
An electric field
How does the strength of a magnetic force change as the distance between two magnets decreases?
The magnetic force becomes stronger.
What happens to the poles of an electromagnet if the direction of the current is reversed?
The poles of the electromagnet reverse.
What are three factors that affect the amount of current generated in a system using electromagnetic induction?
What are two factors that affect the strength of an electric force between two objects?
How does Earth's magnetic field affect a compass, and what force is responsible for this effect?
Earth's magnetic field exerts a magnetic force on the needle of the compass, aligning it to point toward the magnetic north pole.
What is the relationship between electricity and magnetism called?
Electromagnetism.
Explain how the interaction between electric currents and magnetic fields is used to make an electric motor work. Include the role of magnetic force in the process.
Electric motors use the interaction between electric currents and magnetic fields to produce motion. When an electric current flows through a coil of wire inside the motor, it generates a magnetic field. This magnetic field interacts with the field of a permanent magnet, creating a magnetic force that causes the coil (armature) to rotate. The continuous rotation is maintained by reversing the current's direction using a commutator.