A) \[1600\,\Omega \]
B) \[100\,\Omega \]
C) \[200\,\Omega \]
D) \[400\,\Omega \]
Correct Answer: A
Solution :
| [a] \[R=\frac{\rho l}{A}\] \[Al=V\] |
| \[R=\frac{\rho v}{{{A}^{2}}}\] |
| \[\rho \to \] constant |
| \[v\to \] constant |
| \[R\propto \frac{1}{{{A}^{2}}}\propto \frac{1}{{{r}^{2}}}\] |
| \[R\propto \frac{1}{{{r}^{4}}}\] |
| \[{{R}_{2}}=16\,\,{{R}_{1}}=1600\Omega \] |
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