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Q.

When a thin rod of length ‘ l ’ is heated from t10C to t02C length increases by 1%. If plate of length 2l and breadth ‘l ’ made of same material is heated form t10C to t02C, percentage increase in area is

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

ΔAA100=β×Δt×100= 2× ∆LL× 100  SINCE  β=2α
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When a thin rod of length ‘ l ’ is heated from t10C to t02C length increases by 1%. If plate of length 2l and breadth ‘l ’ made of same material is heated form t10C to t02C, percentage increase in area is