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- Homework Statement
- Given the magnetic vector potential of a current carrying loop in cylindrical coordinate system, derive the axial and radial magnetic fields.

- Relevant Equations
- Please read ahead.

I am trying to derive radial and axial magnetic fields of a current carrying loop from its magnetic vector potential. So far, I have succeeded in deriving the radial field but axial field derivation gives me trouble.

My derivation of radial field (eq 1) can be found here.

My derivation of axial field is given below.

In case the images are blurred, you can see them here and here.

On comparing, Eq.7 with Eq.2, the coefficient of E

I have done this derivation multiple times, yet arrive at the same answer.

Can anyone point me where I went wrong?

My derivation of radial field (eq 1) can be found here.

**Can anyone point out where I went wrong in the derivation of axial field?**My derivation of axial field is given below.

In case the images are blurred, you can see them here and here.

On comparing, Eq.7 with Eq.2, the coefficient of E

**do not match**.I have done this derivation multiple times, yet arrive at the same answer.

Can anyone point me where I went wrong?

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