Electrostatics Question 268

Question: To form a composite 16μF, 1000V capacitor from a supply of identical capacitors marked 8μF, 250V , we require a minimum number of capacitors [MP PET 1996; AIIMS 2000]

Options:

A) 0.34 m

B) 1.33 m

C) 13.4 m

D) 33.9 m

Show Answer

Answer:

Correct Answer: D

Solution:

If length of the foil is l then C=kε0(l×b)d

therefore 2×106=2.5×8.85×1012(l×400×103)0.15×103

therefore l = 33.9 m



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