A wire 1.0 mm in diameter carries 5.0 A distributed uniformly over its cross section.
a) Find the field strength 0.10 mm from its axis.
b) Find the field strength at the wire’s surface
The Attempt at a Solution
I've used the Biot-Savart Law for a wire for both of the questions and had the wrong answer both times. Using the wire law: B=(μ_0)(I)/2πr
a) B=(μ_0)(5)/2π((1+0.1)*10^-3) = 9.091*10^-4
b) uses the same approach
i don't understand what numbers to be using or if I'm using the wrong equation's here?
any help is much appreciated