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Yes, usually. The lines are simply shown to illustrate direction and strength of the field.
Hi The different types of Alphabet of lines are:-Visible.-cutting plane lines.-Short breaking lines.-Border lines.-Invisible lines .-Ditto or hidden lines.-Center lines.-Long break lines.-Section lines.-Dimension lines
Any shape that contains a section of a plane can have an infinite number of parallel lines in it.
Contours for a gentle slope are spaced equally and far apart, the closer the contour lines the steeper the slope.