SAT Subject Physics Practice Question 431: Answer and Explanation

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Question: 431

7. At what point between a pair of charged parallel plates will the electric field be strongest?

A. It is strongest between the plates.
B. It is strongest near the positive plate.
C. It is strongest near the negative plate.
D. The field is constant between the plates.
E. The field is variable, therefore the strong point also varies.

Correct Answer: D


The correct answer is (D). The electric field between two parallel plates is constant throughout. The value of the field is defined as E = F/q where E is the electric field, F is force, and q is charge.

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