A) \[2R\]
B) \[R,\]
C) \[\frac{R}{2}\]
D) \[\frac{R}{4}\]
Correct Answer: B
Solution :
First we must write the formula of resistance in terms of diameter and length \[R=\frac{\rho L}{A}\propto \frac{L}{{{D}^{2}}}\] Now, \[\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{{{L}_{2}}/{{L}_{1}}}{{{({{D}_{2}}/{{D}_{1}})}^{2}}}=\frac{4}{{{2}^{2}}}=1\]You need to login to perform this action.
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