Current Electricity Ques 21
21. 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
Show Answer
Answer:
Correct Answer: 21.(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.
BETA
