alleryA wire of resistance R is cut into five equal parts. What is the resistance of each part?
A5R
BR/5
CR/25
D25R
Answer & Solution
Correct answer: B. R/5
1. Resistance is proportional to length for the same material and area.
2. Cutting into five equal parts makes each part one-fifth the original length.
3. So each part has resistance $R/5$.
4. Trap A (5R) would be five parts in series; trap C (R/25) is the parallel combination of all five.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 4 Electricity "Electricity", p.64_
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