A) 1/1
B) \[n/1\]
C) \[{{n}^{2}}/1\]
D) \[1/n\]
Correct Answer: C
Solution :
Resistance, \[R=\frac{\rho l}{A}\] If r be the resistance of one cut part, then \[r=\frac{\rho (l/n)}{A}=\frac{R}{n}\] The resistance R' of the parallel combination is given by \[\frac{1}{R'}=\frac{1}{r}+\frac{1}{r}+.....=\frac{n}{r}\] So, \[R'=\frac{r}{n}=\frac{R/n}{n}=\frac{R}{{{n}^{2}}}\] Hence, \[\frac{R}{R'}=\frac{{{n}^{2}}}{1}\]You need to login to perform this action.
You will be redirected in
3 sec