Question

. A piece of wire of resistance 20 ohm is drawn out so that its length is increased to twice its original length.
Calculate the resistance of the wire in the new situation.

Answer 1

Explanation:

hope this is correct!!!have a nice day

Answer 2

Answer:

40

Explanation:

in the first case

R= 20 ________1

so,old R=L/A _______2

now after doubling the length

new R = 2(L/A)

from eq.2 ,

new R = 2 (old R)

R = 2 (20)

so, R = 40ohm