Search SchoolNGR

Sunday, 21 June 2026
Register . Login

Physics Past Questions and Answers

Topic: Parallel plate capacitors

Jamb Physics Questions - Parallel plate capacitors

Question 16:
An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is
  • A 30V
  • B 40V
  • C 300V
  • D 400V
View Answer & Explanation
Question 17:
Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is
  • A 0.1μF
  • B 0.3μF
  • C 1.0μF
  • D 0.5μF
View Answer & Explanation
Question 18:
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 19:
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 20:
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