JAMB and WAEC Physics questions: Capacitors

23 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Capacitors· JAMB

   Find the combined capacitance of 4 μF and 6 μF capacitors connected in parallel.

   • A10 μF
   • B2.4 μF
   • C24 μF
   • D2 μF

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   Explanation and discussion

2. Question 2· Capacitors· JAMB

   Find the combined capacitance of a 2 μF and a 3 μF capacitor connected in series.

   • A1.2 μF
   • B5 μF
   • C6 μF
   • D0.83 μF

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   Explanation and discussion

3. Question 3· Capacitors· JAMB

   Find the charge on a 10 μF capacitor connected to 50 V.

   • A500 C
   • B5 C
   • C5 × 10⁻⁴ C
   • D2 × 10⁻⁷ C

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   Explanation and discussion

4. Question 4· Capacitors· WAEC

   The unit of capacitance is the

   • Afarad
   • Bcoulomb
   • Chenry
   • Dvolt

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   Explanation and discussion

5. Question 5· Capacitors· WAEC

   Capacitors of 3 μF and 6 μF are connected in series. Find the combined capacitance.

   • A2 μF
   • B9 μF
   • C4.5 μF
   • D18 μF

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   Explanation and discussion

6. Question 6· Capacitors· WAEC

   A charged capacitor stores energy in

   • Aits connecting wires
   • Bthe electric field between its plates
   • Ca magnetic field
   • Dthe battery

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   Explanation and discussion

7. Question 7· Capacitors· WAEC

   A 10 μF capacitor charged to 100 V stores energy of

   • A0.5 J
   • B0.05 J
   • C1,000 J
   • D0.1 J

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   Explanation and discussion

8. Question 8· Capacitors· JAMB

   Inserting a slab of dielectric between the plates of a charged, isolated capacitor

   • Adoubles the plate separation
   • Bdecreases its capacitance
   • Cremoves its charge
   • Dincreases its capacitance

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9. Question 9· Capacitors· JAMB

   A capacitor in a circuit

   • Ablocks steady d.c. but allows a.c. to pass
   • Ballows d.c. but blocks a.c.
   • Cblocks both
   • Dallows both equally

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   Explanation and discussion

10. Question 10· Capacitors· JAMB

    Find the energy stored in a 4 μF capacitor charged to 100 V.

    • A0.04 J
    • B0.02 J
    • C200 J
    • D2 × 10⁻⁴ J

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    Explanation and discussion

11. Question 11· Capacitors· JAMB

    Two 6 μF capacitors are connected in series. Find the combined capacitance.

    • A12 μF
    • B3 μF
    • C36 μF
    • D6 μF

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    Explanation and discussion

12. Question 12· Capacitors· JAMB

    The SI unit of capacitance is the

    • Acoulomb
    • Bhenry
    • Cohm
    • Dfarad

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13. Question 13· Capacitors· JAMB

    The capacitance of a parallel-plate capacitor increases when

    • Athe voltage is increased
    • Bthe distance between the plates is increased
    • Cthe dielectric is removed
    • Dthe area of the plates is increased

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    Explanation and discussion

14. Question 14· Capacitors· WAEC

    The charge on a 5 μF capacitor at 20 V is

    • A25 C
    • B4 × 10⁻⁶ C
    • C100 C
    • D1 × 10⁻⁴ C

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    Explanation and discussion

15. Question 15· Capacitors· WAEC

    Two 4 μF capacitors in series have an effective capacitance of

    • A2 μF
    • B8 μF
    • C4 μF
    • D16 μF

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    Explanation and discussion

16. Question 16· Capacitors· WAEC

    Capacitors of 4 μF and 12 μF are connected in series. Find their combined capacitance.

    • A3 μF
    • B16 μF
    • C8 μF
    • D48 μF

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    Explanation and discussion

17. Question 17· Capacitors· JAMB

    Two capacitors of 2 μF and 3 μF are connected in parallel. Their combined capacitance is:

    • A1.2 μF
    • B0.83 μF
    • C6 μF
    • D5 μF

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    Explanation and discussion

18. Question 18· Capacitors· JAMB

    Capacitors of 2 μF, 3 μF and 5 μF are connected in parallel. Their combined capacitance is

    • A0.97 μF
    • B10 μF
    • C30 μF
    • D5 μF

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    Explanation and discussion

19. Question 19· Capacitors· JAMB

    A 5 μF capacitor is charged to 12 V. Find the charge stored.

    • A0.42 μC
    • B2.4 μC
    • C17 μC
    • D60 μC

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    Explanation and discussion

20. Question 20· Capacitors· WAEC

    A 4 μF capacitor is charged to 100 V. How much energy does it store?

    • A2 × 10⁻⁴ J
    • B0.04 J
    • C200 J
    • D0.02 J

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    Explanation and discussion