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Ampere’s Law

Ampere’s law gives another method to calculate the magnetic field due to a given current distribution.
Fig. 12
As shown in Fig. 12, the line integral of the magnetic field 81782.png around any closed curve is equal to μ0 times the net current i threading through the area enclosed by the curve, i.e.,
Also using 81796.png (where 81802.png = magnetizing field)
The total current crossing the above area is (i1 + i3i2). Any current outside the area is not included in net current. (Outward   +ve, Inward ⊗ → –ve)

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