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Semiconductors and Superconductors

V-I graph of ...

Question

V-I graph of a nichrome wire at three different temperature $t_{1}, t_{2}$ and $t_{3}$ are shown in the figure. What inference can be drawn from the figure?

Resistance of nichrome wire at

t_{1}

is greater than resistance at

t_{2}

and

t_{3}

respectively

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t_{1} < t_{2}

and

t_{2} < t_{3}

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t_{1} < t_{2}

and

t_{3} < t_{2}

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Resistance of nichrome wire at

t_{3}

is greater than resistance at

t_{3}

and

t_{2}

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Solution

The correct option is A Resistance of nichrome wire at $t_{1}$ is greater than resistance at $t_{2}$ and $t_{3}$ respectively
At $t_{1}$ , for given voltage , the produced current produced is less than $t_{2}$ and $t_{3}$ , hence resistance at $t_{1}$ is highest .
As resistance increases with increase in temperature , $R_{1} > R_{2} > R_{3}$ , so $t_{1} > t_{2} > t_{3}$

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V-I graph of a nichrome wire at three different temperature t1,t2 and t3 are shown in the figure. What inference can be drawn from the figure?

V-I graph of a nichrome wire at three different temperature $t_{1}, t_{2}$ and $t_{3}$ are shown in the figure. What inference can be drawn from the figure?