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The magnetic field bar(dB) due to a smal...

The magnetic field `bar(dB)` due to a small current element `bar(dl)` at a distance `vec(r)` and carrying current `'I'` is

A

`bar(dB)=(mu_(0))/(4pi)i((bar(dl)xxbar(r))/(r))`

B

`bar(dB)=(mu_(0))/(4pi)i^(2)((bar(dl)xxbar(r))/(r^(2)))`

C

`bar(dB)=(mu_(0))/(4pi)i^(2)((bar(dl)xxbar(r))/(r))`

D

`bar(dB)=(mu_(0))/(4pi)i((bar(dl)xxbar(r))/(r^(3)))`

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