Răspuns:
1.25 N
Explicație:
F = (μ×I₁×I₂×l)/2π·r
I₁ = I₂ = 500A
l = 1 m
r = 4 cm = 0.04 m
μ = 4π×10⁻⁷ N/A²
F = (4π×10⁻⁷ N/A²×500A×500A××1m)/2π·0.04m
= (2·10⁻⁷ N/A²×250000A²)/0.04
= 2·10⁻⁷ N/A²×6250000A²
= 2·10⁻⁷ N×6.25×10⁶
= 2×6.25×10⁻¹ N
= 12.5×10⁻¹ N
= 1.25 N