Page 472 - Basic Electrical Engineering
P. 472
5.1.1 Field Around a Current-carrying Conductor
To understand further how the magnetic field around a coil is established, we
will first draw the field around a current-carrying conductor and then show
the magnetic field around a coil.
The direction of the lines of force around a current-carrying conductor has
been shown. If the advancement of the screw when it is turned indicates the
direction of the current through the conductor, the direction of the rotation of
the screw will indicate the direction of the flux produced around the
conductor as has been shown in Fig. 5.2 (a). In Fig. 5.2 (b) the cross-sectional
view of the conductors and the direction of the current through them have
been shown by cross and dot. Flux around the conductor have been shown
and their direction is determined by applying the cork-screw rule. When two
conductors or coil sides appear side by side carrying current in the same
direction, a resultant magnetic field gets established as has been shown in
Fig. 5.2 (c).
