Hello, When the fine structure constant (a) is calculated from the electric and magnetic constants. What does each part represent. (1/c) * (1/electric_constant) * (e^2/(2*h)) = a i.e. What does (1/electric_constant) represent? The opposite of vacuum permittivity? And with the magnetic constant: c * magnet_constant * (e^2/(2*h)) = a What is the significance (physically) of (e^2/(2*h)) and why is it a common denominator between both equations? Thanks.