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Physics for IGCSE & O level - Electricity (Section 4 - No. 39)

If the cross-sectional area of a wire is doubled, what happens to its resistance (assuming other factors are constant)?
Doubles
Halves
Quadruples
Stays the same

คำอธิบาย

Resistance is inversely proportional to the cross-sectional area. If the area doubles, resistance is halved.

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