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(C) heater filament works on the principle of the heating effect of electric current $(H = I^2Rt)$.To produce a significant amount of heat, the materi

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high resistivity,high melting point

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(C) heater filament works on the principle of the heating effect of electric current $(H = I^2Rt)$.To produce a significant amount of heat, the material must have high electrical resistivity $(R = \rho L/A)$ so that it generates heat efficiently when current passes through it.Additionally, the filament must have a high melting point so that it does not melt or break when it becomes extremely hot during operation.Therefore, the essential requirements are high resistivity and a high melting point.

What are the essential requirements of a heater filament?

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