The magnetic field strength at any point P due to
incremental length dl carrying current is directly proportional to

- Length of incremental element
- Current carried by the element
- Sine of angle between line joining point P with length dl
- Inversely proportional to the square of distance of this point from the element
- Magnetic field strength

dH α I dl Sin θ / r^{2}

dH = kI dl Sin θ / r^{2}

Where k is constant = ( 1 / 4π
)

- This law is helpful to calculate field strength H due to current carrying conductor

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