SAT Subject Physics Practice Question 308: Answer and Explanation

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Question: 308

4. 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 protons strike the screen?

A.
B.
C.
D.
E.

Correct Answer: D

Explanation:

The correct answer is (D). The protons will deflect in a different direction from the electrons. However, the proton is more massive and therefore will not be deflected as much as the electron is deflected in a field of equal magnitude.

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