4/10/25 Electromagnetism Review

Many homes have a doorbell that visitors push to

get the attention of people inside.  

Based on the diagram, what force operates the doorbell?

• inertia

• magnetism

• friction

What materials are responsible for producing the electrical current in a generator? select 2

• rod

• magnet

• conductive wire

• battery or power source

When a permanent magnet moves through a coil of wire connected to a miniature light bulb, the light bulb begins to glow. How can the permanent magnet make the light bulb glow? (select 2)

• The magnet induces an electric current in the coil and the current powers the light bulb.
• The light bulb glows due to the magnet's color change.
• Kinetic energy is converted to mechanical energy

• The magnet creates a magnetic field that directly lights the bulb.

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 Identify which of the following could be the most likely potential explanations or reasoning for the break

in the graph trend between 30-40 coils.

• There was no rod

• A reduction in the number of loops

• A reduction in the electric current

• An increase in the electric current

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Match the following.

• need a power source and magnetic field

• motor

• conductive wire and magnetic field

• electromagnet

• conductive wire and electrical current

• generator

Mrs. James is trying to create an electric motor that spins super fast.

She decides to introduce more electricity into the motor apparatus to see if that works.

Which of the statements below are true? choose 2

• The amount of electricity is the independent variable.

• The number of loops is the dependent variable

• The speed of the motor is the independent variable.

• The speed of the motor is the dependent variable.

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Magnetic poles repel when

• two like magnetic poles are brought together
• a single magnetic pole is isolated
• two opposite magnetic poles are brought together
• two magnetic poles are at rest without interaction

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electromagnetic means

• Concerned solely with gravitational forces.
• Relating to the interaction of electric and magnetic fields.
• Relating to sound waves and vibrations.
• Describing only static electric fields.

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why does a compass point north

• A compass points north because of the sun's position.
• A compass points north due to the rotation of the Earth.
• A compass points north because it is designed that way.
• A compass points north due to the Earth's magnetic field.

what do you need to create a electric motor?

• A battery, gears, and a switch.
• A solar panel, wheels, and a frame.
• A power source, a fan, and a light bulb.
• A power source, magnets, and conductive wire.

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