Question

What happens to resistance when length of wire is doubled

Answer 1

Explanation:

Resistance increases with length because the electrons have further to go, so suffer greater collisions with atoms in the material. Look at these wires: Electrons moving through the short wire only feel resistance for a short time compared to the longer one. This means its resistance is less.

Answer 2

Answer:

we have

R= rho*l/A

when the length of wire doubled

R1=rho*2l/A

R1=2R