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The magnetic energy stored in a current carrying solenoid is (if B = magnetic field, l = length of solenoid, A = area of cross section of solenoid) : |
$\frac{B^2}{2 \mu_0}$ $\frac{\mu_0 B^2}{2}$ $\frac{\mu_0 B^2 A l}{2}$ $\frac{B^2 A l}{2 \mu_0}$ |
$\frac{B^2 A l}{2 \mu_0}$ |
Energy density of the magnetic field is given by $ u = \frac{B^2}{2\mu_0}$ Magnetic field energy of magnetic field is $ U = uV = \frac{B^2}{2\mu_0}Al$ |
