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AB is a current-carrying conductor in th...

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 point P and Q? Given `r_1gtr_2`, where will the strength of the magnetic field be larger?

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According to Right Hand Thumb Rule, if all fingers of right hand we wrapped in a fist and thumb shows the direction of electric current, then direction of wrapped fingers shows the direction of magnetic field.
In case of `r_(1)` the direction of magnetic field is towards the paper. In case of `r_(2)`, the direction of magnetic field is out of the paper. Since `r_(1) gt r_(2)`, so strength of magnetic field at P is less than that at Q.
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