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A pendulum clock loses 12s a day if the temperature is 40C and gains 4sa day if the temperature is 20C. The temperature at which the clock will show correct time, and the co-efficient of linear expansion (α) of the metal of the pendulum shaft are respectively :

(1)25C;α=1.85×105/C(2)60C;α=1.85×104/C(3)30C;α=1.85×103/C(4)55C;α=1.85×102/C

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