SAT Subject Physics Practice Question 569: Answer and Explanation

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Question: 569

10. A proton and an electron are each placed in an electric field between a pair of parallel plates. The electron is placed exactly halfway between the two plates, and the proton is placed midway between the electron and the negative plate. Which of the following statements is correct about the forces the particles experience?

A. The force on the electron is larger because it has less mass.
B. The force on the proton is larger because it has greater mass
C. The force on the electron is larger because it is in the strongest part of the electric field.
D. The force on the proton is larger because it is closer to the negative plate.
E. They both experience the same force.

Correct Answer: E

Explanation:

The correct answer is (E). The electric field between a pair of parallel plates is uniform in nature. Therefore any charged particle within the field experiences the same force no matter where it is located in the field.

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