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iv. inversely proportional to the square of the distance r of the point from the element of length
dl.
The law can be expressed mathematically as
where 1/4π is the constant of proportionality.
By applying Biot-Savart law, we can determine the magnetic field strength
around current-carrying conductors arranged in different manner. Some of
these are explained as follows.
5.2.3 Application of Biot-Savart Law
a) Magnetic field strength around a long straight current-carrying conductor
Field strength around a long conductor will be calculated by using expression
(5.8) from θ = 0 to θ = π as shown in Fig. 5.8.
Figure 5.8
Thus,
