A) \[{{E}^{2}}/2r\]
B) \[{{E}^{2}}/4r\]
C) \[{{E}^{2}}/r\]
D) \[{{E}^{2}}/3r\]
Correct Answer: B
Solution :
\[i=\frac{E}{r+R}\] Þ \[P={{i}^{2}}\,R\] Þ \[P=\frac{{{E}^{2}}R}{{{(r+R)}^{2}}}\] Power is maximum when r = R Þ \[{{P}_{\max }}={{E}^{2}}/4r\]
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