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The numerical values of a few important constants are listed.

\begin{equation}
 \frac{\mu_0}{4\pi} =10^{-7} \text{henry/meter}
\end{equation}

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Starting form Maxwell's equations for magnetostatics, vector potential is introduced and the Biot-Savart Law is derived.

Relationship between the normal to a surface and the orientation of its boundary curve, as they should appear in Stokes theorem are explained.

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We derive expressions for force, potential energy and torque on a dipole in electric field.

In this section the pressure due to a surface charge density \(\sigma\) on  closed a conducting surface is computed and is shown to be \begin{equation*}
 \text{Force per unit area}= \frac{\sigma^2}{2\epsilon_0}.
\end{equation*}