Electrical Engineering ⇒ Topic : BiotSavart Law and its important points.

Sachin
 
BiotSavart law BiotSavart law gives us expression for the magnetic field at a point due to a current element. Important points about BiotSavart law. This law has the following salient features : (1) BiotSavart law is valid for symmetrical current distributions. (2)BiotSavart law cannot be proved experimentally because it is not possible to have a current carrying conductor of length dl. (3) Like Coulomb's law in electrostatics, BiotSavart law also obeys inverse square law. (4) The direction of dB is perpendicular to the plane containing I dl and r  
 
William
 
Magnetic Field Intensity (H) due to a Current Carrying Element  BiotSavart Law If an element of length dl of a conductor, measured in the direction of current flow, carries a current of I amperes, then the magnetic field intensity at a point P at a distance r from the element is given by dH = I d 1 x r l 4 π r^{3} ........... (1)
FIGURE (a) Magnetic field intensity (H) due to the flow of electric current where, dH is a vector perpendicular to the plane determined by dl are r as shown in Fig. (a). The value of dH depends on the cross product and therefore changes its sign if the direction of flow is changed. Equation (1) gives H in A/m when l is in amperes and dl and r are in metres.The value of dH depends upon the position of point P, and is zero when P lies in line with the element. The direction of dH changes as P moves over to the other side of the element as shown in Fig. (b). figure (b) Magnetic field intensity (H) on either side of a current carrying element Any current carrying conductor must be a closed loop in order to carry the current and the total magnetic field intensity produced by such a loop of wire is given by ............ (2)  
 
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