Current Electricity Charging Discharging Of Capacitors Question 691
Question: If negligibly small current is passed through a wire of length 15 m and resistance of $ 5\Omega $ , having uniform cross section of $ 6\times {{10}^{-7}}m^{2} $ , then coefficient of resistivity of material is
Options:
A) $ 1\times {{10}^{-7}}\Omega -m $
B) $ 2\times {{10}^{-7}}\Omega -m $
C) $ 3\times {{10}^{-7}}\Omega -m $
D) $ 4\times {{10}^{-7}}\Omega -m $
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Answer:
Correct Answer: B
Solution:
[b] $ ( \text{Hint}\Rightarrow \rho =\frac{R.A}{\ell }=\text{Coefficialt of resistivity} ) $
BETA
