# Magnetic air-gap force estimate
# Scope: Uniform gap Maxwell stress; leakage and fringing omitted.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

density = 0.5 T
area = 100 mm^2
muZero = 0.0000012566370614 H/m

force := density^2*area/(2*muZero) [N]

check force target: force >= 5 N

scenario alternative: density = 0.4 T