Electromagnetism Check Point Quiz

What is a device that transforms electrical energy into mechanical energy?

• Motor

• Generator

• Magnet

• Transformer

Electric current is passing through a wire. Under which circumstances below will a magnetic field be created around the wire?

• Only when the wire is absolutely straight.

• Only when the wire makes a complete loop

• Only when the current comes from a battery.

• A magnetic field is always created around a wire when it carries electric current.

A speaker contains a magnet and a solenoid. Which of the following best describes what happens in the speaker when it produces sound?

• The magnet causes the electric current to alternate direction causing the solenoid to vibrate.

• Moving electric charges in the solenoid create a magnetic field that interacts with the magnet causing it to vibrate.

• The solenoid generates electricity by pushing against the magnet.

• The field of the magnet increases voltage in the solenoid.

What will happen if the north pole of one magnet is brought near the south pole of another magnet?

• The poles will repel each other.

• The poles will attract each other.

• Nothing will happen. The poles will not interact.

• The poles will attract each other at first and then repel each other.

How do most scientists believe the Earth's magnetic field is produced?

• Santa

• The motion of neutrons in the outer core of the Earth.

• The motion of electrons in the outer core of the Earth

• The motion of protons in the outer core of the Earth.

What produces ALL magnetic fields?

• Moving charged particles.

• Moving particles.

• Charged particles at rest.

• Moving particles of Earth.

Which conversion process is the basic function of an electric generator?

• Converts low voltage electricity to high voltage electricity.

• Converts mechanical energy to electrical energy.

• Converts direct current (DC) to alternating current (AC).

• Converts electrical energy to mechanical energy.

How could you detect a magnetic field around a bar magnet?

• By using a battery.

• By using a compass.

• By using paper.

• By using your hand.

A compass is brought near a magnet. Which pole of the compass needle will be attracted to the north pole of the magnet?

• North Pole

• South Pole

• Neither pole, it will spin

• The needle will bend so both poles are attracted to the magnet.

Which diagram below best represents the magnetic field around a current carrying wire. The arrow represents the direction of the current.

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