AP Physics 1 Question 125: Answer and Explanation

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Question: 125


Four identical resistors are connected to a battery in the configuration shown in the preceding figure.

Which of the following ranks the current I through each resistor?

  • A. I1 = I4 > I2 > I3
  • B. I1 = I4 > I2 = I3
  • C. I1 = I2 = I3 = I4
  • D. I1 > I2 = I3 > I4

Correct Answer: B


B-Current can only travel through a wire. At the junction after Resistor 1, the current splits; the current comes back together after resistors 2 and 3. Thus, resistors 1 and 4 have the same current that's equal to the total coming from the battery. Since resistors 2 and 3 are identical, they split the current evenly.