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// Example 5.7
// We know that Area of Ring is (A=Pi*R*R)
// i.e A=%pi*R*R*(Q/2%pi)=0.5*R*R*Q;
// Hance by using Faraday's Law
// e= dQ/dt= d(BA)/dt.
// 0.5*B*R*R*(dq/dt).
B=1;
R=1;
f=50;
e=0.5*B*R*R*f*2*%pi; // by using Faraday's Law
disp(' emf Devloped between Centre & ring = '+string(round(e))+' Volt');
// p 198 5.7
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