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<p>each charge in isolation. The value of the <a href="page.php?w=electric_field">electric field</a> at any point around these two charges is found by calculating the <a href="page.php?w=Vector_%28mathematics_and_physics%29">vector</a> sum of the two electric fields from each of the charges acting alone.<br/>
* The <a href="page.php?w=permittivity">permittivity</a> and <a href="page.php?w=Permeability_%28electromagnetism%29">permeability</a> are exactly the electric constant <a href="page.php?w=vacuum_permittivity">{{math</a> and magnetic constant</p><p>
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