12-gauge copper wire has a radius of 1.03×10−3 m. (a) What is the resistance of 11.5 m of this wire at 20°C. (b) How much current will pass through the wire if a potential difference of 9.00 V is applied across it? The resistivity for copper is 1.7E-8 ohm meters For part a: The equation is R=ρ(L/A) and A=∏r2. I solved for Area and got 3.33E-6 m2. Then I did R=1.7E-8(11.5/3.33E-6) R=.0587 ohms. However, when I plug this into the system it says it's wrong. What did I do incorrectly? I double-checked my multiplication and everything.