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प्रश्न
Write an expression of Biot-Savart law in vector form.
समीकरण/सूत्र
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उत्तर
`d vec B = (μ_o I)/(4 pi) (vec(dl) xx hatr)/r^2`
Where:
- `d vec B` = magnetic field due to the current element
- μ0 = permeability of free space
- I = current
- `d vec l` = current element
- `hatr` = unit vector from the current element to the point
- r = distance between the current element and the point
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