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i. Water vapour, ii. Silicon, iii. Zinc,...

i. Water vapour, ii. Silicon, iii. Zinc, iv. Germanium.
For which of the above `"substance"//s"the"V//I` graph is non-linear ?

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The graph of `V//I` is non-linear for water vapour (gas), silicon (semi conductor) and germanium (semi conductor).
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