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In **1820**, the Dutch scientist **Hans Christian Oersted** pointed the field of physics in a new direction with the twitch of a compass needle. We can see the possible connection between electricity and magnetism.
A compass needle is deflected from magnetic north when the electric current from the battery is switched on and off. A wire carrying an electric current radiates magnetic fields from all sides, and it indicated a direct relationship between electricity and magnetism. **Oersted showed that an electrical current can disturb a magnetic compass needle, demonstrating definitively for the first time that moving electricity produces magnetism**.
The direction of deflection of magnetic needle can be easily determined by the **SNOW rule**. According to the SNOW rule, when current flows through a conductor from South to North direction and the wire is held over magnetic needle then the north pole of the magnetic needle deflects towards west.
