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

  • A
    $\frac{1}{2 \mu_0} B^2 AL$
  • B
    $\frac{1}{2 \epsilon_0} B^2 AL$
  • C
    $\frac{1}{2 \mu_0} BA^2 L$
  • D
    $\frac{1}{2 \epsilon_0} BA^2 L$

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