Question

the resistance of a wire of length 250 m is 1 ohm. if the resistivity of the material of wire is 1.6* 10 to the power -8 ohm meter, find the area of cross-section of the wire. how much resistance change if the diameter is doubled?

Answer 1

just apply it into the formula and you'll get the answer. and sorry the diameter one that is the wrong answer it will be d^2