// multi-utility computation suite · offline · instant · precise
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sci.magnetic-force-on-wire Calculator
Calculates force per unit length on a current-carrying conductor in a magnetic field: F/L = BIsin θ. Two parallel wires 1 m apart each carrying 1 A attract with force 0.2 µN/m — this defines the 2019 SI ampere: 1 A produces exactly 2×10⁻⁷ N/m between parallel wires.
Inputs
I A
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
B T
Reference formula or conversion factor shown for context.
Theta Deg
Reference formula or conversion factor shown for context.
Results
magnetic force F (N)
Sample size or count used in the calculation.
F = IL × B × sin(θ)
Sample size or count used in the calculation.
force per metre (N/m)
Sample size or count used in the calculation.
force at 90° (maximum)
The largest value in the dataset or feasible range.
direction
The computed direction or bearing, typically in degrees from north or as a cardinal direction.
two parallel wires 1m apart, 1A
Reference formula or conversion factor shown for context.