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

\includegraphics{fig3.24.eps}

The integral above is easily evaluated by substituting

\begin{eqnarray*} z-d &=& a\cot\theta\\ dz &=& -a {\rm cosec}^2\theta d\theta \end{eqnarray*}

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