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AB is a current-carrying conductor in the plane of the paper as shown in figure.

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AB 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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Magnetic field at P is into the plane of paper and at Q it is out of the plane of paper. The strength of the magnetic field at Q will be larger as strength of the field ∝1/r.

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