JAMB Physics 2010 Objective — Question 34
Question 34 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.
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34. Three capacitors of capacitance 2 microfarad, 4 microfarad and 8 microfarad are connected in parallel and a p.d of 6V is maintained across each capacitor, the total energy store is A. 6.90x10^-4 J B. 6.90x10^-4 J C. 2.52x10^-4 J D. 2.52x10^-6 J
- A. 6.90x10^-4 J
- B. 6.90x10^-4 J
- C. 2.52x10^-4 JCorrect
- D. 2.52x10^-6 J
Explanation
When capacitors are connected in parallel, C_total=C1+C2+C3=2+4+8=14microfarad=1.4x10^-5F. V=6V. Energy=1/2 CTV^2=1/2 x 1.4x10^-5 x 6^2=2.52x10^-4 J.
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