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  4. The variation between V-I has shown by the following four graphs. Which is the V-I graph for heating filament?

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Q. The variation between $V-I$ has shown by the following four graphs. Which is the $V-I$ graph for heating filament?

UP CPMTUP CPMT 2012Current Electricity

Solution:

As the current in heater filament increases, it gets more heated, hence its temperature increases and thereby its resistance increases. Due to which the current will decrease. Hence the variation of $V$ and $I$ for heater filament will as shown in fig.(a).