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Copper and Silicon are cooled from to . The specific resistance
(a)decreases in copper but increases in silicon
(b)increases in copper but decreases in silicon
(c)increases in both
(d)decreases in both

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Important Questions on Current Electricity
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The temperature coefficient of resistance of a wire is per degree Celsius. At its resistance is . The resistance of the wire will be at a temperature:-

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The current-voltage graph for a given metallic conductor at two different temperatures and are shown in the figure. Then:-

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Some electric bulbs are connected in series across a supply in a room. If one bulb is fused, then remaining bulbs are connected again in series across the same supply. The illumination in the room will:

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