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Monday, 15 June 2026
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Physics Past Questions and Answers

Topic: Capacitors

Jamb Physics Questions - Capacitors

Question 26:
If the capacitance of an capacitor is C = (εA)/d, which of the following parameters is varied when a variable capacitors is used for tuning radio sets?
  • A Constant (ε) and area
  • B Area and distance.
  • C Constant (ε) only
  • D Distance only
View Answer & Explanation
Question 27:
A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?
  • A 864 NC<sup style='font-size: smaller;'>-1</sup>
  • B 150 NC<sup style='font-size: smaller;'>-1</sup>
  • C 144 NC<sup style='font-size: smaller;'>-1</sup>
  • D 18 NC<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 28:
Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is
  • A 2.52 x 10<sup style='font-size: smaller;'>-6</sup>J
  • B 6.90 x 10<sup style='font-size: smaller;'>-6</sup>J
  • C 2.52 x 10<sup style='font-size: smaller;'>-4</sup>J
  • D 6.90 x 10<sup style='font-size: smaller;'>-4</sup>J
View Answer & Explanation
Question 29:
The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?
  • A 0.3
  • B 6.0
  • C 3.0
  • D 2.0
View Answer & Explanation
Question 30:
when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will
  • A Increase
  • B Decrease
  • C Decrease then increase
  • D Remain constant
View Answer & Explanation