Module 3 : MAGNETIC FIELD
Lecture 15 : Biot- Savarts' Law

Note that both the angles $\phi_1$and $\phi_2$are acute angles.
If we consider an infinite wire (also called long straight wire), we have $\phi_1 = \phi_2 = \pi/2$, so that the field due to such a wire is

\begin{displaymath}\vec B = \frac{\mu_0 I}{2\pi a} \hat k\end{displaymath}

where the direction of the field is given by the Right hand rule.

         Back