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JAMB Physics 2001 Question 33

Question 33

Capacitors

When a piece of rectangular glass block is inserted between two parallel plate capacitor, at constant plate area and distance of separation, the capacitance of the capacitor will

  1. A.increase
  2. B.decrease
  3. C.decrease, then increase
  4. D.remain constant
Show the answer and explanation

Answer: A (increase)

Explanation

Glass has a higher permittivity than air, and C = εA/d, so putting a glass dielectric between the plates increases the capacitance.