Question

1. What is the resistance of a 100m copper wire with a radius of 0.3 mm?
(Resistivity of copper is 1.6 x 10-8 Ωm)
2. What length of German silver wire, diameter 0.050 cm, is needed to make a 28 resistor if the resistivity of German silver is 2.2 x 10-7 m?
3. The resistance of a metal wire of length 1m is 26Ω at 20 degree Celsius with a diameter of 0.3 mm.
what is its resistivity?

Answer 1

Answer:

Originally Answered: If radius of a wire is doubled then what happens to its resistance?

So by doubling the radius of wire , the resistance of the wire will become 1/4 time the previous resistance.