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In a tungsten electric-bulb, a coil of ...

In a tungsten electric-bulb, a coil of wire, rather than a straight wire, is used.

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A coil of wire has much greater surface area than a straight wire if enclosed in the same bulb. This results in more emission of light.
Hence, in a tungsten electric-bulb, a coil of wire, rather than a straight wire, is used.
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