Electrostatics Question 532

Question: Four condensers each of capacity $ 4\mu F $ are connected . $ V _{P}-V _{Q}=15volts $ . The energy stored in the system is [CPMT 1976, 89]

Options:

A) $ 2400\ ergs $

B) $ 1800\ ergs $

C) $ 3600\ ergs $

D) $ 5400\ ergs $

Show Answer

Answer:

Correct Answer: B

Solution:

Total capacitance of given system $ C _{eq}=\frac{8}{5}\mu F $

$ U=\frac{1}{2}C _{eq}V^{2}=\frac{1}{2}\times \frac{8}{5}\times {{10}^{-6}}\times 225=180\times {{10}^{-6}}J $

$ =180\times {{10}^{-6}}\times 10^{7}erg=1800erg $



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