Understanding Physical Science

Mini-Quiz: Electromagnetic Devices

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Take this Mini-Quiz to check your understanding of the lesson material.

QUIZ

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How is the magnetic field made to vary in a loudspeaker?
A varying electrical signal changes the strength of the electromagnetThat is correct. You are becoming an inventive Champion. Sound from the loudspeaker created a varying magnetic fieldSorry, not correct. Try another button. Radio waves move the speaker coneGood try, but not right. Select another answer.
Why is an electromagnet good for picking up and dropping things?
It attracts aluminum and other metalsOops! Wrong answer. Re-read the question and try again. Once an object is picked up, it become magnetized and is repelledSorry, not correct. Try another button. The electromagnetic field can easily be turned off and onCorrect. You know your electromagnetism.
What is big advantage of a maglev train?
It can move at the speed of lightGood try, but not right. Select another answer. There is no friction from wheels on a trackThat is correct. You are becoming an inventive Champion. The train never stops movingOops! Wrong answer. Re-read the question and try again.

Pick an answer to see instant feedback. Re-read the lesson if you miss one.

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Use your imagination to create new applications

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