WAEC Physics 2020 Objective — Question 21
Question 21 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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A parallel plate capacitor is charged and the charging battery subsequently disconnected. If the plates of the capacitor are moved farther apart by means of insulating handles, the
- A. capacitance would increase
- B. capacitance would decreaseCorrect
- C. charge on the capacitor would increase
- D. charge on the capacitor would decrease
Explanation
As C = q.A/d, C is proportional to 1/d. Since the battery is disconnected (charge q remains constant), moving the plates farther apart (increasing d) decreases the capacitance.
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