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Physics Past Questions and Answers

Topic: Parallel plate capacitors

Jamb Physics Questions - Parallel plate capacitors

Question 11:
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 12:
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
Question 13:
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
Question 14:
The diagram above shows two capacitors P and Q of capacitance 2μF and 4μF respectively connected to a d.c source. The ratio of energy stored in P to Q is
  • A 4:1
  • B 2:1
  • C 1:4
  • D 1:2
View Answer & Explanation
Question 15:
The energy stored in a capacitor of capacitance 10μF carrying a charge of 100μC
  • A 5 x 10<sup style='font-size: smaller;'>4</sup> J
  • B 4 x 10<sup style='font-size: smaller;'>2</sup> J
  • C 4 x 10<sup style='font-size: smaller;'>-3</sup> J
  • D 5 x 10<sup style='font-size: smaller;'>-4</sup> J
View Answer & Explanation