Electromagnetism



B - Flux density (Tesla, T)
I - Current (Ampere, A)
r - Distance from the wire
μ_o - Permeability of free space = 4π X 10^-7 (T-m/A) (N/A²)



F - Force (Newton, N)
I - Current (Ampere, A)
l - Length of conductor (meter)



F - Force (Newton, N)
I₁, I₂ - Currents in the two wires (Ampere, A)
r - Distance between the two wires (meter, m)
L - Length of the wires (meter, m)
μ_o - Permeability of free space = 4π X 10^-7 (T-m/A) (N/A²)