What is the Magnetic Field Inside and Outside a Conducting Cylinder?

[Paymemoney]

Homework Statement

A conducting cylinder of radius r0 carries a current I uniformly throughout its
volume. Find an expression for the magnetic field H at a distance r from the
axis of the cylinder (a) for r < r0 , and (b) for r > r0 .

Homework Equations

Biot-Savart Law
Amperes Law

The Attempt at a Solution

I am not sure if this is correct

a) H=i*dL*sin(\theta)/4pi*r^2 for r < r0

b) H=i*dL*cos(\theta)/4pi*r^2 for r > r0

P.S

 

[tiny-tim]

Hi Paymemoney!

(try using the X² and X₂ buttons just above the Reply box )

a) H=i*dL*sin(\theta)/4pi*r^2 for r < r0

b) H=i*dL*cos(\theta)/4pi*r^2 for r > r0

uhh? what's dL? what's θ?

use ∫ H.dl round a circle​