SAT Subject Physics Practice Question 439: Answer and Explanation

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Question: 439

15. Which of the following is caused completely or in some part by magnetic lines of force?

A. The picture on a computer screen
B. Radio reception interference
C. Aurora Borealis
D. V.H.S. films
E. All of these

Correct Answer: E


The correct answer is (E). Your computer picture is caused by manipulating a magnetic yoke to produce a picture. The interference with radio is caused by magnetic lines and radio waves interacting. VHS films are produced by magnetic pulses, and the Aurora Borealis is the visual show produced when cosmic particles enter the earth's magnetic field.

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