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In vector form the magnetic induction dB...

In vector form the magnetic induction dB at a point of distance r from centre of element of length dl is given as

A

`bar (dB) = mu_0/(4 pi) [(Idl sin theta)/r^2]`

B

`bar (dB) = mu_0/(4 pi) [(I bar(dl) xx bar r)/r^2]`

C

`bar (dB) = mu_0/(4 pi) [(I bar r xx bar (dl))/r^3]`

D

`bar (dB) = mu_0/(4 pi) [(I bar(dl) xx bar r)/r^3]`

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