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Q. The magnetic energy stored in a long solenoid of area of cross-section $A$ in a small region of length $L$ is

Electromagnetic Induction

Solution:

$\frac{\text { Energy }}{\text { Volume }}=\frac{B^{2}}{2 \mu_{0}}$
$ \Rightarrow $ Energy $=\frac{B^{2}(A L)}{2 \mu_{0}}$