CBSE Class 12-science Answered
Two wires of equal lengths, one of copper and other nickel have the same resistance. Which wire is thicker?
Asked by Topperlearning User | 04 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.
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 | 04 Jun, 2014, 03:23: PM
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