// Example  7.1

L=4;                 // Induction of a Coil 
di=10-4;             // Decrease in Current 
dt=0.1;              // time Required to Decrease Current
e=L*(di/dt);         // Formula of Self induction
disp(' emf induced in a Coil is = '+string(e)+' Volt');



       //  p 228     7.1