What are the essential requirements of a heater filament ?

high resistivity , low melting point

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low resistivity , low melting point

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high resistivity , high melting point

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low resistivity , high melting point

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Solution

The correct option is C high resistivity , high melting point
According to the joule's law of heating .
$H = i^{2} R t$
So , greater the resistance (i.e., greater resistivity), greater the heat produced.
To bear the amount of heat produced , the melting point of the element must be high .

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