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SAT SUBJECT TESTS: Physics Question #1

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Question:

Questions 1-2 relate to the diagram below.

Answer the questions about the parts of the electrical circuit listed below by choosing the letter that correctly represents the quantity in question.

Between which two points is the resistance the largest?



Choices:
A. between points A and B
B. between points B and C
C. between points C and D
D. between points D and E
E. all of the above



The correct answer is B. Calculate the total resistance between each pair of points:

Between points A and B are three in parallel. The total resistance of the 3, , is:

The resistance between points B and C is , as there is only one resistor. Similarly, the resistance between points C and D is .

Between points D and E, there are two resistors in parallel. The total equivalent resistance of the two, , is:

So, the largest resistance is between points B and C: . Choice B is correct.

 

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