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JAMB Physics 2011 Question 33

Question 33

Capacitors

The capacitance of a parallel plate capacitor is 20 μF in air and 60μF in the presence of a dielectric. What is the dielectric constant?

  1. A.3.0
  2. B.2.0
  3. C.0.3
  4. D.6.0
Show the answer and explanation

Answer: A (3.0)

Explanation

Dielectric constant = capacitance with dielectric ÷ capacitance in air = 60 ÷ 20 = 3.0.