A car headlight filament is made of tungsten and has a cold resistance of 0.350 . If

Question:

A car headlight filament is made of tungsten and has a cold resistance of 0.350 Ω. If the filament is a cylinder 4.00cm long (it may be coiled to save space), what is its diameter?

Strategy

We can rearrange the equation R = ρL/A to find the cross-sectional area A of the filament from the given information. Then its diameter can be found by assuming it has a circular cross-section.

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