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Main concepts
Biot-Savart-Laplace law: , where – a vector of magnetic intensity of a field, which is created of the element of a current I ; – a radius-vector from the element I to the target point. The modulus of magnetic field intensity: a) the endless straight wire with a current I at a distance of r from the wire ; b) the segment of straight wire with a current I at a distance of r ^ from the axis of a segment , where a1 and a2 – angles, which are created radius-vectors, traced from the ends of a conductor to the target point at which field is being calculated; c) at the centre of the current-carrying coil of the radius R with a current I ; D) at the axis of the current-carrying coil , where а – is the distance from the centre of coil to the target point at the axis;
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