A) \[2.4cm\]
B) \[0.24cm\]
C) \[0.024\text{ }cm\]
D) \[24cm\]
Correct Answer: C
Solution :
Specific resistance\[\rho =\frac{RA}{l}\] \[=\frac{R\pi {{r}^{2}}}{l}\] \[\Rightarrow \] \[{{r}^{2}}=\frac{\rho l}{R\pi }\] \[=\frac{64\times {{10}^{-6}}\times 198}{7\times 3.14}\] \[r=0.024\,\,cm\]You need to login to perform this action.
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