SAT Subject Physics Practice Question 505: Answer and Explanation

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Question: 505

6. Four 6 resistors are available to form a resistor network. Which of the following is NOT a possible value for the total resistance of the resistor combinations?

A. 24
B. 12
C. 8
D. 6
E. 1.5

Correct Answer: B

Explanation:

The correct answer is (B). The resistors can be combined in the following ways:

4 resistors in series = 24Ω

4 resistors in parallel = 1.5Ω

3 resistors in parallel together with one resistor in series with the parallel resistors = 8Ω 2 resistors in parallel together that are in series with 2 more resistors that are in parallel together = 6Ω

2 resistors in parallel together that are in series with 2 resistors in series together = 15Ω

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