# Biot-Savarts law

by Niles
Tags: biotsavarts
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 P: 1,863 Hi When solving Biot-Savarts law for a current loop of radius R, the magnetic field on the axis of the loop is given by (in Tesla) $$B(z) = \mu_0I\frac{R^2}{(R^2+z^2)^{\frac{3}{2}}}$$ where I is the current through the loop. However, this derivation assumes that the loop has an infinitesimal thickness. But how is the "proper" way to take into account the fact that a current loops has a finite thickness? My book on Electrodynamics (Griffiths) does not address this issue, and it is something I have thought about for some time. Best, Niles.
PF Gold
P: 2,031
 Quote by Niles Hi When solving Biot-Savarts law for a current loop of radius R, the magnetic field on the axis of the loop is given by (in Tesla) $$B(z) = \mu_0I\frac{R^2}{(R^2+z^2)^{\frac{3}{2}}}$$ where I is the current through the loop. However, this derivation assumes that the loop has an infinitesimal thickness. But how is the "proper" way to take into account the fact that a current loops has a finite thickness? My book on Electrodynamics (Griffiths) does not address this issue, and it is something I have thought about for some time. Best, Niles.
I suppose by carrying out a more sophisticated integration where,perhaps,the thick coil can be considered as a number of narrow coils connected side by side and making good electrical contact with eachother.

(Is your equation missing a 2pi?)

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