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1AB is a current carrying conductor in the plane of the paper as shown in figure. What are the directions of magnetic fields produced by it at points P and Q? Given r1 > r2, where will the strength of the magnetic field be larger?
 
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Apply , the direction of magnetic field produced by a current carrying conductor at Point P – .
 
Point Q – .
 
As magnetic field is  to distance, the  will be larger than the .