Magnetic effect of current, Oersted experiment and Amperes swimming rule –
In this topic we will discuss about magnetic effect of current,Oersted experiment and Ampere’s swimming rule.
Magnetic effect of current–
When electric current passes through a conductor (conducting wire) then magnetic field developed around the conductor.
The intimate relationship between electricity and magnetism was discovered 200 years ago , Oersted discovered in the year 1820 that a straight wire carrying current cause a deflection in a nearby magnetic compass needle.
Oersted’s experiment and Ampere’s swimming rule-
According to Oersted’s experiment , we take a needle NS which is free to rotate . We place the needle above a current carrying wire AB . If current flows through the wire in the direction A to B and from B to A then deflection in the needle shown in the figure . Since magnetic needle can deflect only in the interaction of the another magnetic field . so it is confirmed that due to flow of current in a conductor magnetic field setup across around the wire.
The direction of deflection in the magnetic needle due to current in the wire is given by Ampere swimming rule . According to this rule ‘ If a man swimming along the wire in the direction of current with his face turned always towards the needle , so that the current enters through his feet and leaves in his had , then north pole of the magnetic needle will be deflected towards his left hand’ .