Question

The electrical resistance R of a wire varies directly as the length I of the wire and inversely as the square of its diameter d. If 20 meters of wire of diameter 1.5 mm has a resistance of 12 ohms, what is the resistance of 20 meters of the same wire if the diameter is increased to 5 mm?

Answer 1

Okay

Answer 2

Huh?

Answer 3

R= k L/d^2
k 20/(1.5)^2=12
let's find k
k=1.35

R=1.35 L/D^2
= 1.35 (20/25)

Answer 4

R=1.08

Answer 5

Thank you so much :)