First slide

Magnetic field due to a straight current carrying wire

Question

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

NA

A

greater than at Q
B

same as at Q
C

less than at Q
D

greater or less than at Q depending upon the strength of the current

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 side. Hence B_p = B_Q (at same distance).

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