Question
Fri June 29, 2012 By: Puneeta Budhwar
 

when a magnetic needle is placed perpendicular to a current carrying straight conductor then it does not show any deflection.why?

Expert Reply
Sun July 01, 2012
The magnetic field in a current carrying conductor is always perpendicular to the direction of flow of current and forme\s a closed lop i.e in this case forms a circle around it.
Thats why is a needle of compass is placed perpendicular to the current carrying conductor the magnetic field is either in the direction of needle or antiparallel to it.
hence in both cases it does not show any deflection.
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