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Question 4 of 36

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SAT Subject Test

The set of lettered choices below refers to multiple questions.  Select the one lettered choice that best answers each question.  A choice may be used once, more than once, or not at all in each set.

The figure presents a rectangle containing a point charge and 5 labeled points. The point charge is in the middle of the rectangle horizontally and about one fifth of the way down from the top. At the same vertical level as the point charge are 3 labeled positions. Point A is to the far left of the point charge, point B is to the left of the point charge, about one fourth of the way toward point A, and point C is to the far right. Directly below the point charge is point E, about three fourths of the way down from the top. Points A, C, and E are all the same distance from the point charge. Point D is directly below point A and at the same vertical position as point E.

This question relates to a point charge + Q fixed in position, as shown in the diagram. Five points near the charge and in the plane of the page are shown.

At which point will an electron experience a force directed toward the top of the page?

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The correct answer is point E, which is directly below the point charge + Q. The electron is negatively charged and since unlike charges attract, it will always experience a force directed straight toward the charge + Q, which is fixed in position. The only labeled point where a force toward + Q is directed toward the top of the page is point E.

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