Two wires of equal lengths, one of copper and other nickel have the same resistance. Which wire is thicker?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

Let  and  be resistivities of copper and nickel. A1 and A2 be the area of cross-section these wires. Since the two wires have the equal lengths and have the same resistance, therefore:

 
Since the resistivity of copper  is less than that of nickel (), it follows that area of cross-section of copper wire is less than that of nickel wire. Thus, nickel wire is thicker.

Answered by  | 4th Jun, 2014, 03:23: PM