WAEC Physics 2024 Objective — Question 5
Question 5 of 50 from the West African Examinations Council (WAEC) Physics 2024 Objective paper, with the correct answer and a full explanation.
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5. The capacitance of a parallel plate capacitor A.
- A. decreases when the separation between the plates decreases.
- B. increases when the potential difference between the plates is increased.
- C. is greater without a dielectric between the plates.
- D. is greater with dielectric between the plates than without dielectric.Correct
Explanation
C=k(epsilon0)A/d, also C=Q/V. When separation (d) decreases, capacitance must increase since they vary inversely to each other. When potential difference increases, capacitance will decrease (inverse relationship). With no dielectric between the plates, k=1; with a dielectric, k>1, so C is greater when a dielectric is between the plates.
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