Electrostatics Question 606

Question: A 20F capacitor is charged to 5V and isolated. It is then connected in parallel with an uncharged 30F capacitor. The decrease in the energy of the system will be [EAMCET 2001]

Options:

A) 25 J

B) 200 J

C) 125 J

D) 150 J

Show Answer

Answer:

Correct Answer: D

Solution:

ΔU=C1C22(C1+C2)(V1V2)2

=20×302(20+30)(50)2=150J



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