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दो तार समान पदार्थ के बने है और दोनों के आयतन भी समान हैं | पहले तार को अनुप्रस्थ-काट का क्षेत्रफल A और दूसरे तार की अनुप्रस्थ-काट का क्षेत्रफल 3 A हैं | यदि बल F लगाकर पहले तार की लम्बाई में `Deltal` की वृद्धि की जाती है, तो दूसरे तार की लम्बाई में भी इतनी की वृद्धि करने की लिए कितने बल की आवश्यकता होगी ?
A. 9 F
B. F
C. 4 F
D. 6 F.

1 Answer

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Best answer
`Y=(Fl)/(Adeltal)`
`becauseV=Al" अत: "l=(V)/(A)`
`F=(YA Deltal)/(l)=(YA^(2)Deltal)/(V)`
`(F_(1))/(F_(2))=((A_(1))/(A_(2)))^(2)=(F)/(F_(2))=((A)/(3A))^(2)=(1)/(9)`
`F_(2)=9F.`

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