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       Whenever a current flow occurs through a conductor ,a magnetic field will establish around the conductor.The magnetic effect of current was discovered by Oersted found that a wire carrying a current was able to deflect a magnetic needle.

 The nature of the magnetic field lines around a straight current carrying conductor is concentric circles with the center of  the axis of the conductor. 

The direction of the magnetic field lines of force around a conductor is given by the Maxwell’s right hand grip rule or the right handed corkscrew rule. 

The strength of the magnetic field created depends on the current through the conductor. 

                          The magnetic effects of electricity is enabled in many applications such as solenoids,electric relays,electric motor etc.