AP Police Constable practice question
A uniform wire of resistance 5 ohm is stretched uniformly so that its length becomes double. Its new resistance will be
From a AP Police Constable Science practice set · Science
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Correct answer: (C) 20 ohm
Stretching keeps the volume constant, so doubling the length halves the area. R = ρL/A becomes ρ(2L)/(A/2) = 4R = 4 × 5 = 20 ohm.
हिंदी में प्रश्न
5 ఓమ్ నిరోధం గల ఒక ఏకరీతి తీగను దాని పొడవు రెట్టింపు అయ్యేలా సాగదీశారు. దాని కొత్త నిరోధం
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सही उत्तर: (C) 20 ohm
ఘనపరిమాణం స్థిరం కాబట్టి పొడవు రెట్టింపైతే మధ్యచ్ఛేద వైశాల్యం సగం అవుతుంది. R ∝ L² కావున R' = 4 × 5 = 20 ఓమ్.
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