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Monday, 15 June 2026
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Physics Past Questions and Answers

Topic: Capacitors

Jamb Physics Questions - Capacitors

Question 16:
Two parallel plates at a distance of 8.0 x 10-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?
  • A 4.8 Vm<sup style='font-size: smaller;'>-1</sup>
  • B 75.0Vm<sup style='font-size: smaller;'>-1</sup>
  • C 4800.0Vm<sup style='font-size: smaller;'>-1</sup>
  • D 75000.0Vm<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 17:
The purpose of a dielectric material in a parallel plate capacitor is to
  • A Increase its capacitance
  • B Decrease its capacitance
  • C Insulate the plate from each other
  • D Increase the magnetic field between the plates
View Answer & Explanation
Question 18:
Two 50\(\mu\)F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is
  • A 5.00 x 10<sup style='font-size: smaller;'>-5</sup>C
  • B 2.50 x 10<sup style='font-size: smaller;'>-3</sup>C
  • C 1.25 x 10<sup style='font-size: smaller;'>-3</sup>C
  • D 1.00 x 10<sup style='font-size: smaller;'>-2</sup>C
View Answer & Explanation
Question 19:
A parallel plate capacitor has a common plate area of 5 x 10-8m2 and plate separation of 2 x 103m, Assuming free space, What is the capacitance? [\(\varepsilon\)o = 9.0 X 10-12C2N-1m-2]
  • A 2.25 x 10<sup style='font-size: smaller;'>-17</sup>F
  • B 4.50 x 10<sup style='font-size: smaller;'>-17</sup>F
  • C 2.25 x 10<sup style='font-size: smaller;'>-16</sup>F
  • D 4.50 x 10<sup style='font-size: smaller;'>-16</sup>F
View Answer & Explanation
Question 20:
In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is
  • A 3.0 x 10<sup style='font-size: smaller;'>4</sup>J
  • B 3.0 x 10<sup style='font-size: smaller;'>2</sup>J
  • C 2.5 x 10<sup style='font-size: smaller;'>-2</sup>J
  • D 6.0 x 10<sup style='font-size: smaller;'>-3</sup>J
View Answer & Explanation