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State Biot Savart's law...

State Biot Savart's law

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According to this law magnetic field due to a small conductor of length dl, carrying current I at a distance r is given by `dB= (mu_(0))/(4pi) (I dl sin theta)/(r^(2))`
`theta` = angle b/w small current element and line joining the mid point of current element to observation point
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