Question

A copper wire has a diameter of 0.5 mm and resistivity of 1.6×10-8 Ωm.

(a) What will be the length of this wire to make its resistance 10 Ω ?

(b) How much does the resistance change if the diameter is doubled ?​

Answer 1

Answer:

a ) New Lenght is 122.6 m

b ) Resistance change = 10 - 2.5 = 7.5 Ω