A) \[3\times {{10}^{-9}}ohm\]
B) \[3\times {{10}^{-7}}ohm\]
C) \[3\times {{10}^{-5}}ohm\]
D) \[3\times {{10}^{-3}}ohm\]
Correct Answer: B
Solution :
Length l = 1 cm \[={{10}^{-2}}m\] Area of cross-section A = 1 cm ´ 100 cm \[=\text{ }100c{{m}^{2}}=\text{ }{{10}^{2}}{{m}^{2}}\] Resistance \[R=\text{ }3\times {{10}^{7}}\times \frac{{{10}^{-2}}}{{{10}^{-2}}}=\text{ }3\times {{10}^{7}}\Omega \]You need to login to perform this action.
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