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Find the energy stored in the magnetic f...

Find the energy stored in the magnetic field if current of 5A produces a magnetic flux of `2xx10^(-3)` Wb through a coil of 500 turns.

A

2.5J

B

0.25J

C

250J

D

1.5J

Text Solution

Verified by Experts

The correct Answer is:
A
`N phi = LI`
`L = (Nphi)/(I) = (500 xx 2 xx 10^(-3))/(5) = 0.2 H`
`U_m = 1/2 LI^2 = 1/2 xx 0.2 xx (5)^2 = 2.5 J`
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