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    Electric & Magnetic fields - inner product

    I have read that the electric and magnetic fields are always "perpendicular". Is that true? And if so, does that mean the inner product of the two vectors is zero? E_x * B_x + E_y * B_y + E_z * B_z = 0 ? Also, is there any special meaning in electrodynamics to the quantity: | B |^2...