Question

A copper wire has a resistance of 0.5 ohms. Another copper of the same as the first one is double in length of the first. Find the resistance of the second wire.

Answer 1

Answer:

Given

• Resistance of first Cooper wire : 0.5 ohms
• Material used is same for both the wires. It means Resistivity is same

To find :

• Resistance of second Cooper wire

Solution :

Resistance of first copper wire :

• p x l/A
• 0.5 = p x l/A

Resistance of second Cooper wire :

• p x 2l/A

We have : p x l/A = 0.5 ohms

Puting the value :

• 2 x p x l/A
• 2 x 0.5
• 1.0
• 1 ohms

Resistance of second Cooper wire : 1 ohms