Solve a system of two nonlinear equations?

Questions
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1

Hi
I am new to Mathematica. I am trying to solve a system of two nonlinear equations:

f1[z_, x_] := i0*z*(z^2 + (ha + x)^2)^(-1/2)
f2[z_, x_] := 2*i0*(x + ha)*(x^2 + (ha + x)^2)^(-3/2)
Solve[i == f1[z, x] && didx == f2[z, x], {z, x}]

Here z and x are the variables, all the rest are known constants.
Mathematica gives an error message:
Solve::nsmet: This system cannot be solved with the methods available to Solve.
What is the right way to solve such equations?
I’ve also included the original nb file

equations.nb (11.4 KB)

2

It seems I’ve found the answer on the Web. For a numerical solution of non-polinomial equations one should use FindRoot instead of Solve or NSolve. I am having some other trouble with FindRoot too but, I think, I should post a different question for that

3

Solve works for me.

equations ver2.nb (16.7 KB)