A) \[40\,\Omega \]
B) \[\frac{40}{3}\Omega \]
C) \[\frac{5}{2}\,\Omega \]
D) \[100\,\Omega \]
Correct Answer: A
Solution :
For same material and same length \[\frac{{{R}_{2}}}{{{R}_{1}}}=\frac{{{A}_{1}}}{{{A}_{2}}}=\frac{3}{2}\] \[\Rightarrow \] \[{{R}_{2}}=3{{R}_{1}}\] Resistance of thick wire \[{{R}_{1}}=10\,\Omega \] \[\therefore \]Resistance of then wire \[{{R}_{2}}=30\,\Omega \] Total resistance in series \[=10+30=40\,\Omega \]You need to login to perform this action.
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