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Q)

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 $100^{\circ}C$ is : <br> (For steel Young’s modulus is $2 \times 10^{11} N m^{–2}$ and coefficient of thermal expansion is $1.1 \times 10^{–5} K^{–1}$ )


( A ) $2.2 \times 10^7 $ Pa
( B ) $2.2 \times 10^9 $ Pa
( C ) $2.2 \times 10^8 $ Pa
( D ) $2.2 \times 10^6 $ Pa

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