the resistance of a wire is 20 ohm. find its resistance when the length becomes double?
Answers
Answered by
1
Answer:
Explanation:
R = 20
R = rho (l) / A
l' = 2l
Volume will remain the same
lA=l'A'
lA = 2lA'
A' = A/2
R' = rho 2l / (A/2)
R' = 4 rho (l) / A
R' = 4R
Similar questions