The device or substances which do not obey Ohm’s law is/are

Question

The device or substances which do not obey Ohm’s law is/are (A) copper (B) crystal rectifiers (C) iron (D) resistors

Tardigrade Admin · Accepted Answer

Crystal rectifiers are semiconductor devices hence they do not obey ohm’s law

Q. The device or substances which do not obey Ohm’s law is/are