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Question
State Biot-Savart law.
A current I flows in a conductor placed perpendicular to the plane of the paper. Indicate the direction of the magnetic field due to a small element d `vecl` at point P situated at distance `vecr` from the element as shown in the figure.
Solution
Biot-Savart’s law states that the magnitude of the magnetic field dB is proportional to the current I, the element`|dl|`, and inversely proportional to the square of the distance r.
The direction of magnetic field is along the negative X-direction.
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