Question

A cylindrical tungsten filament 15.0 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 13.5 A at all temperatures ( Resistivity of tungsten at 20 ∘C is 5.25×10−8Ω⋅m , the temperature coefficient of resistivity at 20 ∘Cis 0.0045 ∘C−1 )

Part B

What will be its resistance with that field?

Express your answer using two significant figures.

R=?

Part C

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

Express your answer using two significant figures.

question2

A wire 6.00 m long with diameter of 2.00 mm has a resistance of 0.0320 Ω .

Find the resistivity of the material of the wire.

Answer 1

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