SAT Subject Physics Practice Question 98: Answer and Explanation

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Question: 98

8. In the figure below, what must be the direction of the magnetic field?

A. To the left, in the plane of the page
B. Upward, in the plane of the page
C. Downward, in the plane of the page
D. Out of the plane of the page
E. Into the plane of the page

Correct Answer: D

Explanation:

The magnetic field B cannot be in the plane of the page (because both v and FB are), so we can eliminate A, B, and C. If B pointed into the plane of the page, it’s easy to see that the right-hand rule tells us that FB would point upward in the plane of the page. Therefore, B must point out of the plane of the page.

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