Module 3 : MAGNETIC FIELD
Lecture 19 : Mutual Inductance
   
\includegraphics{fig3.51b.eps}
   
  Thus the energy initially stored must have been $(1/2)LI_0^2$. If an inductor carries a current $I$, it stores an energy $(1/2)LI^2$. Thus the toroidal inductor discussed earlier stores an energy
 
\begin{displaymath}\frac{\mu_0N^2hI^2}{4\pi}\ln\frac{b}{a}\end{displaymath}
  when it carries a current $I$. We eill now show that this is also equal to the volume integral of $B^2/2\mu_0$.
   
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