Q13 of 32 Page 100

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?

Since the deflection in the compass will be maximum when magnetic field and electric current are perpendicular to each other. So, to obtain no deflection in the magnetic compass, the current carrying conductor should be placed in the same plane.


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