A solenoid of length 2.2m has a diameter of 0.9. The magnetic field at its centre is 0.4tesla . estimate the energy stored in the field of this coil.
Gives
B=0.4TB=0.4TB=0.4T
l=2.2ml=2.2ml=2.2m
r=0.92r=\frac{0.9}{2}r=20.9 m
U=B22μAlU=\frac{B^2}{2\mu}AlU=2μB2Al
Area
A=πr2A=\pi r^2A=πr2
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