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  4. A vertical straight conductor carries a current upward. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is

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Q. A vertical straight conductor carries a current upward. A point $P$ lies to the east of it at a small distance and another point $Q$ lies to the west at the same distance. The magnetic field at $ P $ is

ManipalManipal 2008Moving Charges and Magnetism

Solution:

Magnitude of magnetic field at any point due to a straight current carrying conductor depends only on the distance of the point with respect to current carrying conductor but not on the direction. Hence, $ {{B}_{P}}={{B}_{Q}} $ (at same distance).