The numerical values of a few important constants are listed.
We briefly present Gaussian units and trace the source of appearance of velocity of light in Maxwell's equations.
\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.
The equation of continuity for conservation of electric is derived. An expression for current in a wire is obtained in terms of number of electrons per unit volume.
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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Expressions for force on line and volume elements of a current in magnetic field are derived.
We derive expressions for force, potential energy and torque on a dipole in electric field.
Using Stokes theorem and Maxwell's equation \(\text{curl} \vec E =0\) it is proved that the tangential component of the electric field vanishes outside, just near the surface, vanishes.
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*}
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