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Using = š^0 H find the ratio E^0/H^0 for a plane electromagnetic wave propagating through vacuum. Show that it has the dimensions of electric resistance. This ratio is a universal constant called the impedance of free space.
Sol. E = Q/Ļµ base 0 A (Electric field) ā = E.A. = Q/Ļµ base 0 A A/2 = Q/Ļµ base 0 2 i base 0 = Ļµ base 0 dā base E/dt = Ļµ base 0 d/dt (Q/Ļµ base 0 2) = 1/2 (dQ/dt)
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