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(b) what is the magnetic field at the origin

I found this to be zero

(c) Find the magnetic field at points along the z axis as a function of z.

I don't even know where to begin

(d) At what distance d along the positive z axis teh the magnetic field a maximum?

(e) What is this maximum value?

I feel as though I have to find out (c) before I can do (d) or (e). If someone could help me get a start on this I would greatly appreciate it.

Relevant eqns.

[F][/B]/L=(mu*I1*I2)/(2*pi*a)

[tex]\oint[/tex] B [tex]\bullet[/tex] ds = mu*I

B=(mu*I)/(2*pi*a)

Please help me out. Thank you in advance