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HomePhysics5.Two wires A and B of same length and of the same material have the respective radii and . Their one end is fixed with a rigid support, and at the other end equal twisting couple is applied. Then the ratio of the angle of twist at the end of A and the angle of twist at the end of B will be

5.Two wires A and B of same length and of the same material have the respective radii and . Their one end is fixed with a rigid support, and at the other end equal twisting couple is applied. Then the ratio of the angle of twist at the end of A and the angle of twist at the end of B will be

(a) r1 2 /r2 2                                         (b) r2 2 /r1 2

(c) r2 4 /r1  4                                        (d)  r1 4 /r2 4

Answer-c

(9)

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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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