# What are called lines of magnetic induction? How to determine the direction of the lines of magnetic induction of a conductor

What are called lines of magnetic induction? How to determine the direction of the lines of magnetic induction of a conductor with current; current coils; permanent magnet?

Lines of magnetic induction are lines, tangents to which coincide in direction with the vector of magnetic induction at a given point of the field.
The direction of the vector of magnetic induction of the field of a straight conductor and a coil is determined by the gimbal’s rule. The vector of magnetic induction at any point of the field is directed tangentially to the line of magnetic induction. The magnetic induction vector of a horseshoe-shaped magnet is perpendicular to its ends and directed from the north pole to the south pole.

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