A) \[R{{n}^{2}}\]
B) \[{{n}^{2}}/r\]
C) \[R{{r}^{2}}\]
D) \[{{r}^{2}}/R\]
Correct Answer: D
Solution :
: \[R=r+r+r+\].................... up to n terms \[\therefore \] \[R=nr\] ....................................... (i) In parallel, \[\frac{1}{Z}=\frac{1}{r}+\frac{1}{r}+\frac{1}{r}+\]..........................up to\[n\]terms \[\therefore \]\[\frac{1}{Z}=\frac{n}{r}\] Or \[Z=\frac{r}{n}\] ...................................... (ii) \[RZ=nr\times \frac{r}{n}\]or\[Rz={{r}^{2}}\]or\[Z=\frac{{{r}^{2}}}{R}\]
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