A) \[\frac{2A{{\varepsilon }_{o}}}{\operatorname{d}}\left[ \frac{1}{{{k}_{1}}}+\frac{1}{{{k}_{2}}}+\frac{1}{{{k}_{3}}} \right]\]
B) \[\frac{A{{\varepsilon }_{o}}}{\operatorname{d}}\left[ \frac{1}{{{k}_{1}}}+\frac{1}{{{k}_{2}}}+\frac{1}{{{k}_{3}}} \right]\]
C) \[\frac{2A{{\varepsilon }_{o}}}{\operatorname{d}}\left[ {{k}_{1}}+{{k}_{2}}+{{k}_{3}} \right]\]
D) \[\frac{A{{\varepsilon }_{o}}}{\operatorname{d}}\left[ \frac{{{k}_{3}}}{2}+\frac{{{k}_{1}}{{k}_{2}}}{{{k}_{1}}+{{k}_{3}}} \right]\]
Correct Answer: D
Solution :
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