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AB is a current carrying conductor in the plane of the paper as shown in Figure 13.7. 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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Solution:
By using right hand thumb rule, we can find out the direction of magnetic field due to a current carrying wire.
In the given diagram, the magnetic field lines will be close circular loop.
By keeping thumb along the current carrying wire, the direction can be deduced and  it will be anticlockwise, if we see it from above.
Therefore, magnetic field at point B will be into the plane of paper and at point Q, it would be outside the plane of paper.
As we go away from the wire, the magnetic field strength decreases in magnitude. Hence magnetic field strength will be
stronger at point B and weaker at point Q relatively.

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