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HomePhysics22. A wire of length L and cross-sectional area A is made of a material of Young’s modulus Y. It is stretched by an amount x. The work done is

22. A wire of length L and cross-sectional area A is made of a material of Young’s modulus Y. It is stretched by an amount x. The work done is

(a) (YxA)/(2L)                                                        (b) (Yx2 A)/(L)

(c)  (Yx2 A)/(2L)                                                    (d)  (2Yx2 A)/(L)

Answer-c

(24)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (126)

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