(Answered) What is the fractional change in the resistance of an iron

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What is the fractional change in the resistance of an iron filament when its temperature changes from 0oC to 100oC?

A 20 mF capacitor is charged by a 5.0 V battery through a resistance R. The capacitor reaches a potential difference of 4.0 V in a time 3.0 s after charging begins. Find R.

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