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State Biot-Savart's law. |
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Answer» Solution :The MAGNITUDE of magnetic field d`vec(B) ` at a point P at a distance r from the small elemental length taken on a conductor carrying current varies (i) directly as the STRENGTH of the current I (ii) directly as the magenitude of the length ELEMENT d`vec(L)` (iii)directly as the sine of the angle (SAY, `theta`) between d `vec(l) and hat(r)` . (iv) inversely as the square of the distance between the point P and length element d `vec(l)`. this is e`xx`pressed as . `d B prop ("I dl")/(r^(2)) sin theta` |
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