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

Show Answer

Answer:

Correct Answer: 13. (a)

Solution:

  1. (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.