Magnetic effect of current,Oersted experiment and Amperes swimming rule

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’ .

 

231 thoughts on “Magnetic effect of current,Oersted experiment and Amperes swimming rule