SAT Subject Physics Practice Question 309: Answer and Explanation

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Question: 309

5. The diagram below shows atomic particles moving through a magnetic field.

A beam of electrons is deflected in the magnetic field shown. The electrons that have passed through the field strike the screen at point P.

At which letter would a stream of electrons strike the screen if the poles of the magnet were reversed?

A.
B.
C.
D.
E.

Correct Answer: E

Explanation:

The correct answer is (E). When the field is reversed, the electron is deflected in the opposite direction with the same magnitude.

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