The following four wires of length $L$ and radius $r$ are made of the same material. Which of these will have the largest extension, when the same tension is applied?
The following four wires of length $L$ and radius $r$ are made of the same material. Which of these will have the largest extension, when the same tension is applied?
- A
$L = 100\ cm, r = 0.2\ mm$
- B
$L = 200\ cm, r = 0.4\ mm$
- C
$L = 300\ cm, r = 0.6\ mm$
- D
$L = 400\ cm, r = 0.8\ mm$
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The pressure that has to be applied to the ends of a steel wire of length $10\ cm$ to keep its length constant when its temperature is raised by $100^o C$ is: (For steel Young's modulus is $2 \times 10^{11}$ $Nm^{-1}$ and coefficient of thermal expansion is $1.1 \times 10^{-5}$ $K^{-1}$ )
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- [JEE MAIN 2014]
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