. State Ampere's Law

Best Answer

Ampere’s law gives another method to calculate the magnetic field due to a given current distribution. Consider a current distribution as shown in the figure. The figure shows a curve enclosing the currents  . We assign the direction to these currents by right hand thumb rule. First we assign a sense to the curve by putting an arrow on the curve. Then we curl the right hand fingers along the arrow on the curve, the stretched thumb then give the positive direction of current. From the figure  and   are into the plane and hence in the stretched direction of the thumb and hence are positive while   is out of the plane (hence in the opposite direction of the thumb stretched) of the paper, hence is negative.



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