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Q.

The expression for the magnetic energy stored in a solenoid of length L, in terms of magnetic field B and area A is

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a

$\frac{1}{2 μ_{0}} B^{2} AL$

b

$\frac{1}{2 μ_{0}} {BA}^{2} L$

c

$\frac{1}{2 ϵ_{0}} B^{2} AL$

d

$\frac{1}{2 ϵ_{0}} {BA}^{2} L$

answer is A.

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