Current Electricity Charging Discharging Of Capacitors Question 348
Question: Dimensions of a block are $ 1,cm\times 1,cm\times 100,cm $ . If specific resistance of its material is $ 3\times {{10}^{-7}}ohm-m $ , then the resistance between the opposite rectangular faces is
[MP PET 1993]
Options:
A) $ 3\times {{10}^{-9}}ohm $
B) $ 3\times {{10}^{-7}}ohm $
C) $ 3\times {{10}^{-5}}ohm $
D) $ 3\times {{10}^{-3}}ohm $
Show Answer
Answer:
Correct Answer: B
Solution:
Length l = 1 cm $ ={{10}^{-2}}m $ Area of cross-section A = 1 cm ´ 100 cm $ =100cm^{2}=10^{2}m^{2} $ Resistance $ R=3\times 10^{7}\times \frac{{{10}^{-2}}}{{{10}^{-2}}}=3\times 10^{7}\Omega $
BETA
