2.1.3. Magnetic field of a current-carrying conductor
Presentation of the magnetic field
Figure 5 presents the magnetic field of a current-carrying conductor.
1 Current flow direction
Stipulations for current presentation
- Where the current flows away from the viewer, that is to say into the paper plane, a cross is indicated in the conductor cross-section.
- Where the current flows towards the viewer, that is to say out of the paper plane, a dot is entered into the conductor cross-section.
Direction of field lines
As Figure 6 indicates the direction of the magnetic field lines depends on the current direction. If one views the conductor cross-section in current direction, then the field lines appear clockwise.
If one clamps such a current-carrying conductor with one’s fist so that the projecting thumb points in current direction, then the bent fingers indicate the direction of the field lines.
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