Current Electricity - Result Question 12
13. The resistivity (specific resistance) of a copper wire
[2002]
(a) increases with increase in its temperature
(b) decreases with increase in its cross-section
(c) increases with increase in its length
(d) increases with increase in its cross-section
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Answer:
Correct Answer: 13. (a)
Solution:
- (a) Resistivity of copper wire increases with increase in temprature as $\rho_t=\rho_0(1+\alpha t)$
Copper being a metal has positive coefficient of resistivity.
