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Question
A10 m aluminium flagpole is installed at 30°C. After 2 days, the temperature drops to -10°C, How much does the height change of the flagpole (in mm)? (Assume thermal expansion coefficient for aluminum = 23 × 10–6 °C-1)
10 eh- ,Y;qehfu;e dh ¶ySx iksy dks 30°C ij j[kk x;k gSA 2 fnu ckn rki –10°  rd de gks tkrk gSA ¶ySx iksy Å¡pkbZ esa fdruh (mm) esa ifjorZu gksxk\
¼eku ysa ,Y;qehfu;e dk rkih; izlkj xq.kkad ¾ 23 × 10–6 °C-1gSA½
A.
9.2 mm
B.
9.5 mm
C.
7.8 mm
D.
8.8 mm
Answer ( Option A)

9.2 mm

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