Page 482 - Basic Electrical Engineering
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From Fig (5.8),
dl sin θ = r dθ
Substituting
Flux density in a medium of air is
b) Field strength around a circular loop
A circular coil of radius r metres carrying a current of I amperes has been
shown in Fig. 5.9. The field strength at a point P which is situated at a
distance of d metres from the centre of the coil is to be determined. Let dl 1
and dl be the two elements of length diametrically opposite to each other on
2
the circular path. Applying Biot-Savart law, the field strength at P due to
current, the elements of length dl and dl , respectively are
2
1
