Question

A current of 0.94 A flows through a copper wire 0.56 mm in diameter when it is connected to a potential difference of 15 V. How long is the wire in km?

Answer 1

Current, I = 0.94 A

Potential difference across the wire, V = 15 V

Diameter of wire, D = 0.56 mm = 5.6*10^-4 m

Area of cross section of the wire,

Resistivity of copper,

Let length of the copper wire = L

Therefore length of the wire is 0.23 km.

answered by: anonymous