Physics for IGCSE & O level - Electricity (Section 8 - No. 26)
If a copper wire has twice the diameter of another copper wire, what is the relationship between their resistances?
The resistance of the wider wire is half.
The resistance is the same.
The resistance of the wider wire is double.
The resistance of the wider wire is four times more.
Explanation
Resistance is inversely proportional to the square of the diameter.
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