Answer to Question #303781 in Electricity and Magnetism for Khateeja

Question #303781

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.

1
Expert's answer
2022-02-28T13:51:29-0500

Gives

B=0.4TB=0.4T

l=2.2ml=2.2m

r=0.92r=\frac{0.9}{2} m

U=B22μAlU=\frac{B^2}{2\mu}Al

Area

A=πr2A=\pi r^2


U=0.422×4π×107×π×0.81×2.24=89100JU=\frac{0.4^2}{2\times4\pi\times10^{-7}}\times\frac{\pi \times0.81\times2.2}{4}=89100J


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