SAT Subject Physics Practice Question 470: Answer and Explanation

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Question: 470

1. Four resistors are hooked together in parallel. The resistors have values of 20, 40, 60, and 80 respectively. What is the total resistance of the resistors?

A. 4.4
B. 9.6
C. 14.8
D. 20
E. 25.2

Correct Answer: B


The correct answer is (B). The total resistance for a set of resistors in parallel is found by using the sum of the reciprocals. That is to do the following yielding the decimal solution Which is

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