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Asked by ujjwalusri | 06 Mar, 2019, 09:07: PM
answered-by-expert Expert Answer
Figure.1 shows the direction of deflection of magnetic compass needle when it is placed below a current carrying conductor.
As shown in figure-1, current direction is from north to south. Current passing through conductor produces magnetic field surrounding it.
The direction of mgnetic field will be known using right-hand rule
( right-hand rule :- Hold the current carrying conductor in right hand by enclosing the conductor using fingers and keeping the thumb
in the direction of current. Then curling direction of fingers shows the direction of magnetic field).
 
Magnetic field direction is shown in figure. Below the conductor, magnetic field lines are coming out of the plane of figure.
Since magnetic compass needle will align in the direction of magnetic field, it will deflects towards east direction.
 
For the same reason, if the magnetic compass is placed above the conductor it will deflect towards west 
because above the conductor, magnetic field lines are passing towards the plane of figure. This is illustrated in figure-2
 
Moving coil galvanometer is working on this principle
Answered by Thiyagarajan K | 07 Mar, 2019, 09:25: AM

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