U2L2E2 Analyzing Current and the Magnetic Force

What is the main purpose of a compass?

• To find true North

• To measure electric current

• To generate magnetic force

• To create an electric charge

Why does a compass needle change direction when a magnet is placed next to it?

• The Earth's magnetic force is stronger than the magnet's force

• The magnet's force is stronger than the Earth's magnetic force

• The Earth's magnetic force cancels out the magnet's force

• The magnet's force repels the Earth's magnetic force

What happens when an electric charge moves through a wire?

• It becomes a permanent magnet

• It repels any nearby magnets

• It creates an electric field around it

• It generates a magnetic field around it

What is the shape of the magnetic field around a wire?

• Cube

• Sphere

• Cone

• Cylinder

What is the purpose of a solenoid?

• To create a permanent magnet

• To measure the strength of an electric current

• To generate electricity from a magnetic field

• To concentrate the magnetic field in a smaller area

Why does wrapping wire into a solenoid shape increase the strength of the magnetic field?

• It reduces the resistance of the wire

• It increases the flow of electric charges

• It concentrates the magnetic field in a smaller area

• It generates a stronger electric current

What is the purpose of an iron core in an electromagnet?

• To reduce the strength of the magnetic force

• To amplify the force of the current

• To generate an electric charge

• To create a permanent magnetic field

How does changing the electric current in an electromagnet affect the magnetic force generated?

• Higher current has no effect on the force

• Higher current decreases the force

• Higher current increases the force

• Higher current changes the direction of the force

What conclusion can you draw about how changing the number of loops in a wire affects the strength of the magnetic force?

• More loops have no effect on the force

• More loops decrease the force

• More loops increase the force

• More loops change the direction of the force

The electromagnet with 30 loops of wire is able to lift ________ mass then the electromagnet with 60 loops of wire.

• Less

• No

• More

• The same