Electrostatics Question 104

Question: The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is 2μF . The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is [CBSE PMT 2000]

Options:

A) 11.2μF

B) 15.6μF

C) 19.2μF

D) 22.4μF

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Answer:

Correct Answer: A

Solution:

C=ε0KAd

therefore C1C2=K1K2×d2d1

2C2=12.8×(0.4/2)(0.4)

therefore C2=11.2μF



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