Question

Which of these substances acts as a non-Ohmic

• A. Nichrome wire
• B. Tungsten filament
• C. Copper wire
• D. Aluminum filament

Answer 1

The correct option is B

Tungsten filament

Explanation of correct answer:

1. Non-ohmic conductors are conductor which does not obey ohm's law.
2. The resistance of a filament lamp or bulb changes with the temperature of the filament as the potential across it increases and this means it is non-Ohmic.

Explanation of incorrect option(s):

1. The materials which strictly obey Ohm's law are known as Ohmic materials.
2. Silver, copper, nichrome, and aluminum are examples of ohmic conductors.

Hence, tungsten filament is an example of non-ohmic conductor, and option (B) is the correct answer.