Current Electricity Charging Discharging Of Capacitors Question 325
Question: The resistivity of iron is $ 1\times {{10}^{-7}},ohm-m $ . The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in $ ohm-m $ will be
[CPMT 1983; DPMT 1999]
Options:
A) $ 1\times {{10}^{-7}} $
B) $ 2\times {{10}^{-7}} $
C) $ 4\times {{10}^{-7}} $
D) $ 8\times {{10}^{-7}} $
Show Answer
Answer:
Correct Answer: A
Solution:
Resistivity of some material is its intrinsic property and is constant at particular temperature. Resistivity does not depend upon shape.
BETA
