A cylindrical tungsten filament 14.0 cm long with a diameter of 1.10 mm is to be…

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A cylindrical tungsten filament 14.0 cm long with a diameter of 1.10 mm is to be…

A cylindrical tungsten filament 14.0 cm long with a diameter of 1.10 mm is to be used in a machine for which the temperature will range from room temperature (20 ∘C) up to 120 ∘C. It will carry a current of 12.5 A at all temperatures ( Resistivity of tungsten at 20 ∘C is 5.25×10−8Ω⋅m , the temperature coefficient of resistivity at 20 ∘C is 0.0045 ∘C−1 )

Part A

What will be the maximum electric field in this filament?

Express your answer using two significant figures.

Part B

What will be its resistance with that field?

Express your answer using two significant figures.

Part C

What will be the maximum potential drop over the full length of the filament?

Express your answer using two significant figures.

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Reference no: EM132069492

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