Question

How can direction of magnetic field lines at a place be determined ????



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Answer 1

The direction of the cross product may be found by application of the right hand rule as follows: The index finger points in the direction of the velocity vector v. The middle finger points in the direction of the magnetic field vector B. The thumb points in the direction of the cross product F.

Answer 2

A magnetic field line is a route along which a free north-pole serves to lead. The direction of a magnetic field at a point is concluded by placing a small compass needle. The North pole of the compass shows the direction of the magnetic field at that point.

Magnetic field lines appear from the North pole and join at the South pole. The intensity of the magnetic field is determined by the level of closeness of the field lines. The field is definite where the field lines are congested. Magnetic lines do not inter-cross with each other.