why is the tungsten used almost exclusively for filaments of electric lamps
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Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point. Due to its high melting point, the tungsten filament can be kept white hot without melting away.
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Bcoz tungsten has a very high melting point... So even i great amount of current passes it won't affect the bulb.
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