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Q.

A uniform metal rod is used as a bar pendulum. If the room temperature rises by 100C,and the coefficient of linear expansion of the metal of the rod is 2×10−6per 0C, the period of the pendulum will have percentage increase of

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a

−2×10−3

b

−1×10−3

c

2×10−3

d

1×10−3

answer is B.

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Detailed Solution

∆T= 12α∆t %increase= ∆T×100
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