The magnetic effect of electric current is the creation of a magnetic field around a current-carrying conductor. The magnetic field lines around a straight current-carrying conductor are concentric circles with the center at the axis of the conductor. The direction of the magnetic field produced due to a current-carrying conductor depends on the direction in which the current is flowing. The magnitude of the magnetic field produced by electric current increases with an increase in electric current and decreases with a decrease in electric current. The magnetic effect of electric current is one of the major effects of electric current in use, without which we cannot have motors in the existing world.

To summarize, the magnetic effect of electric current is the creation of a magnetic field around a current-carrying conductor. The magnitude of the magnetic field produced depends on the direction and strength of the current. This effect is essential for the functioning of motors and generators.