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Energy Stored in an Inductor

U=(1/2)LI^2

 L=µ0(N^2/l)A = µ0(N^2/l)A*(l/l)= µ0(N^2/l^2)Al = µ0(N^2/l^2 = n^2)Al = µ0n^2V

 L=µ0n^2V

 U=(1/2)µ0n^2VI^2