Electrostatics Question 556

Question: A 4μF condenser is connected in parallel to another condenser of8μF . Both the condensers are then connected in series with a 12μF condenser and charged to 20 volts . The charge on the plate of 4μF condenser is [MP PET 1989]

Options:

A) 3.3μC

B) 40μC

C) 80μC

D) 240μC

Show Answer

Answer:

Correct Answer: B

Solution:

Equivalent capacitance of the circuit Ceq=6μF

Charge supplied from source Q = 6x 20 =120 mC Hence charge on the plates of 4 mF capacitor =Q=4(4+8)×120=40μC



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