How to calculate Hall Electrical Conductivity with Calculator and examples

[insert_php]
if(isset($_POST[‘cal’]))
{
$σ=$_POST[‘con’];
$B=$_POST[‘mfd’];
$ne=$_POST[‘End’];
$e=-1.602176462e-19;
$σd=$_POST[‘dc’];
$σH=($σ*$B)/($ne*$e)* $σd;
echo ” Result is = $σH”;
}
[/insert_php]