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Question

# How is dynamic resistance(say r) of a non-ohmic resistor different from ohmic resistance(say R) of an ohmic resistor

A
R is variable, r is constant
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B
R is constant, r is constant
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C
R>0,r0
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D
R>0, r can be negative, zero or positive
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Solution

## The correct option is D R>0, r can be negative, zero or positiveOhmic resistance always show a positive value of resistance.Ex: Copper Non-ohmic conductors may have a positive dynamic resistance. In such a case, slope>0.Ex: DiodeNon-ohmic conductors may have a negative dynamic resistance. In such a case, slope<0.Ex: DIAC.

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