MCAT Physics Question 88: Answer and Explanation
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Question: 88
13. Which of the following will most likely increase the electric field between the plates of a parallel plate capacitor?
- A. Adding a resistor that is connected to the capacitor in series
- B. Adding a resistor that is connected to the capacitor in parallel
- C. Increasing the distance between the plates
- D. Adding an extra battery to the system
Correct Answer: D
Explanation:
The electric field between two plates of a parallel plate capacitor is related to the potential difference between the plates of the capacitor and the distance between the plates, as shown in the formula 
The addition of another battery will increase the total voltage applied to the circuit, which, consequently, is likely to increase the electric field. The addition of a resistor in series will increase the resistance and decrease the voltage applied to the capacitor, eliminating choice (A). Adding a resistor in parallel will not change the voltage drop across the capacitor and should not change the electric field, eliminating choice (B). Increasing the distance between the plates, choice (C), would decrease the electric field, not increase it.