𝐄𝐥𝐞𝐜𝐭𝐫𝐢𝐜𝐢𝐭𝐲 & 𝐌𝐚𝐠𝐧𝐞𝐭𝐢𝐬𝐦: Electromagnets

Betty made a simple electromagnet using just a battery and a wire. What could Betty do to increase the strength of her electromagnet?

• Coil the wire around a paper towel roll.

• Coil the wire around a nail.

• Coil the wire around a test tube.

• Coil the wire around a toothbrush.

Which of the following would decrease the strength of this electromagnet?

• removing its iron core

• increasing the number of wire loops in the coil

• adding batteries to the circuit

• increasing the current through the coil

Which of the following is a way to increase the strength of an electromagnet?

• Increase the amount of electricity running through the coil.

• Increase the temperature of the air around it.

• Replace the iron core with a plastic core.

• Increase the temperature of the iron core.

The electromagnet picked up the entire pile of paper clips as soon as it's turned on. Which of the following might allow the electromagnet to pick up one paper clip at a time?

• increasing the number of batteries supplying voltage to the electromagnet

• increasing the distance between the electromagnet and the paper clips

• increasing the number of loops in the electromagnet's coil

• removing the iron nail from the core of the electromagnet

An electromagnet could be found in which of the following objects?

• 
• 
• 
• 

Frank wants to make a simple electromagnet. Which of these does Frank need to have to create the electromagnet?

• magnet

• battery

• iron filings

• light bulb

True or False:

The strength of an electromagnet can be altered by increasing the number of coils around the core.

• True

• False

Electromagnetic technology is used in many different ways today. Which of these are uses of this technology?

• high-speed trains

• electric generators

• metal detectors

• all of these

Electromagnetic technology becomes more advanced to fill ever more complex roles. Which of these is an application of electromagnets?

• refrigerator coils

• car brake systems

• speaker and microphone technology

• all of these

As the electrons flow through the wire, _______ is generated around the wire.

• a magnetic field

• gravitational potential energy

• a convection current

• elastic potential energy