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

Start by interpreting that first sentence, and turning it into an equation. That will make the rest much easier to do.

Answer 2

Would the answer be 1.08?

Answer 3

Hello?

Answer 4

That's the answer I got, yes.

Answer 5

Thank you so much! :)

Answer 6

Congrats on getting it right!