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  • A magnetic compass needle is placed in the plane of paper near point A as shown in Figure 13.6. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Unde

A magnetic compass needle is placed in the plane of paper near point A as shown in Figure 13.6. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?

Answers (1)

Solution:
By using right hand thumb rule, we can find out the direction of magnetic field due to a current carrying wire. These field lines form circle in plane perpendicular to the wire.
In the given case; If we keep the wire in the plane of paper, it will cause magnetic field perpendicular to the plane.
The field will be parallel to the vertical axis of compass needle. As a result there will be no change in the deflection of compass needle.
The deflection is maximum when the wire through the point A is perpendicular to the plane of paper. In that case, field due to it is parallel to the plane of paper

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