Question

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please explain the above formula in detail.

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Answer 1

2 × 22/7  × r

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Answer 2

This formula allows us to calculate magnetic fields from the relation between the electric current that generate this magnetic field .It states that for a closed path the sum over element of the components of the magnetic field is equal to electric current multiplied by the empty stomach permeability

More info

B = magnetic field

dl = infinitesimal segment of the integration path

uo = empty stomach permeability

I = enclosed electronic current by path

Hey.. buddy. ...That's all I knew...

I hope it helps you...