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Mobility:, , It is defined as the magnitude of drift velocity of charge per unit electric field applied., epee Le, E mE m, Its SI unit is m?s~1v~4or ms~1N7}., Practical unit of mobility is cm?V~1s~1., Ohmic substances: The substances which obey Ohm's law are known as ohmic substances., e.g. resistors, metals etc., , Non-Ohmic substances: The devices or substances which do not obey Ohm's law are called, non-Ohmic substances., , e.g. Diodes, rectifiers, transistors etc.