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PHYSICS NOTES Magnetic Effect of Current SECTION I The magnetic field: Magnetic field is the region around the moving charge in which magnetic force is experienced by the magnetic substances. Magnetic field is a vector quantity and also known as magnetic induction vector. It is represented by B Lines of magnetic induction may be drawn in the same way as lines of electric field. The number of lines per unit area crossing a small area perpendicular to the direction of the induction being numerically equal to B. The number of lines