Harmful electromagnetic effect on affected line from disturbing line

When two transmission lines are parallel, one line will disturb another due to inductive and capacitive coupling. This paper presents precise formulas for calculating interference in symbolic form. It illustrates relationship between interference and mutual inductance, capacitance, impedance, attenuation, parallel length clearly. Some new work has been done. One most common situation is considered, in which two lines parallel have attenuation and their length are not equal. In addition, some important cases are used to verify the solution