AB is a current carrying conductor in the plane of the paper as shown in the figure. What are the directions of magnetic fields produced by it at points P and Q?

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into the plane of paper at P and out of it at Q

into the plane of paper at P and Q

out of the plane of paper at P and Q

into the plane of paper at Q and out of it at P

answer is D.

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Detailed Solution

According to the right-hand thumb rule, the magnetic field would rotate counterclockwise, as depicted in the diagram around the current's direction.
Therefore, the magnetic field at point P would be directed into the paper's plane.
The magnetic current would be flowing away from the paper's plane at point Q.
Since the conductor's strength is inversely related to distance from it, the magnetic field is greater close to the conductor and weaker as we go away from it.
The magnetic field would be stronger at point Q than near point P because point P is farther away from the conductor than point Q is from the conductor.

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