Electrostatics Question 87

Question: The capacitance of an air filled parallel plate capacitor is 10μμF . The separation between the plates is doubled and the space between the plates is then filled with wax giving the capacitance a new value of40×1012farads . The dielectric constant of wax is [AMU 1995]

Options:

A) 12.0

B) 10.0

C) 8.0

D) 4.2

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Answer:

Correct Answer: C

Solution:

C1=ε0Ad and C2=Kε0A2d

therefore C2C1=K2

therefore 40×101210×1012=K2

therefore K = 8



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