Identify the portion corresponding to negative resistance.
A
AB
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B
BC
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C
CD
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D
D
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Solution
The correct option is C CD
Using Ohm's law, I=1RV
Thus the slope of I-V graph gives the reciprocal of resistance. Hence the resistance is negative in the region where the slope of I-V graph is negative.
From figure, slope is negative in the region CD, thus portion CD corresponds to negative resistance.