State Biot- Savant's law and express …
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Yogita Ingle 5 years, 3 months ago
The Biot Savart's Law we know is given by:
δB = μ0/4π Idlsin(θ)/r2, where θ is the angle between the line element dl and the radial unit vector r^.
Now we know: r^=rr, using this and the cross product of two vectors we get; δB = 4μ0/4π (Id-r)/r2
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