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स्टील की ठीक 20 मीटर लम्बी पटरी `-10^(@)C` ताप पर दृढ़ आधारों के बीच (जिनकी दुरी ठीक 20 मीटर है) कसी गई है | यदि ताप बढ़कर `35^(@)C` हो जाये, तो पटरी आधारों को कितने बल से दबायेगी ? (पटरी का परिच्छेद-क्षेत्रफल `=5.0xx10^(-3)" मीटर"^(2)`, रेखीय ताप प्रसार गुणांक `=11xx10^(-6)" प्रति"""^(@)C` तथा यंग-प्रत्यास्थता गुणांक `Y=2.0xx10^(11)" न्यूटन"//"मीटर"^(2)`)

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