1(x)
The graph of voltage vs current for four different materials is shown below.
Which of these four materials would be used for making filament of a bulb?
- (a)Q
- (b)S
- (c)P
- (d)R
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P
Reason — The filament of a bulb should produce a high heating effect so its resistance should be high. From the graph, slope of line for substance P is the greatest hence, resistance of P is highest. So, substance P is most suitable for making the filament of a bulb.