A) 0.012 J
B) 0.0218 J
C) 0.0375 J
D) 3.75 J
Correct Answer: C
Solution :
\[\Delta U=\frac{1}{2}\frac{{{C}_{1}}{{C}_{2}}{{({{V}_{2}}-{{V}_{1}})}^{2}}}{({{C}_{1}}+{{C}_{2}})}\]\[=\frac{(3\times 5)\times {{10}^{-12}}\times {{(500-300)}^{2}}}{(3+5)\times {{10}^{-6}}}\] \[=\frac{15\times {{10}^{-12}}\times 4\times {{10}^{4}}}{8\times {{10}^{-6}}}=0.0375\,J\]
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