RRB Technician Grade 3 practice question
The resistance of a wire is 2 Ω. If it is cut into four equal parts, the resistance of each part will be:
From a RRB Technician Grade 3 Science practice set · Science
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Correct answer: (B) 0.5 Ω
Resistance is proportional to length (R = ρL/A). Cutting the wire into 4 equal parts makes each part's length 1/4 of the original, so each part's resistance = 2/4 = 0.5 Ω.
हिंदी में प्रश्न
एक तार का प्रतिरोध 2 Ω है। यदि इसे चार बराबर भागों में काटा जाए, तो प्रत्येक भाग का प्रतिरोध क्या होगा?
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उत्तर और व्याख्या देखें
सही उत्तर: (B) 0.5 Ω
प्रतिरोध लंबाई के समानुपाती होता है (R = ρL/A)। तार को 4 बराबर भागों में काटने पर प्रत्येक भाग की लंबाई मूल लंबाई की 1/4 हो जाती है, अतः प्रत्येक भाग का प्रतिरोध = 2/4 = 0.5 Ω होगा।
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