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How does the resistance of a metallic wire change when it is made thicker, keeping its length and material the same?
AResistance increases
BResistance decreases
CResistance stays equal
DResistance becomes zero
Answer & Solution
Correct answer: B. Resistance decreases
1. Resistance is inversely proportional to cross-sectional area: $R \propto \dfrac{1}{A}$.
2. Making the wire thicker increases its area $A$.
3. A larger area means a smaller resistance, so resistance decreases.
4. It does not stay constant because area is changing.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.63_
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