What is the fractional change in the resistance of an iron


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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Physics: What is the fractional change in the resistance of an iron
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