First slide

Thermal expansion

Question

Length of steel rod is 50 cm more than length of brass rod at all temperatures . If $α_{st} = 12 \times 10^{- 6} /^{\circ} C, α_{B r} = 18 \times 10^{- 6} /^{\circ} C$ . Length of steel rod is

Easy

A

100 cm
B

150 cm
C

50 cm
D

200 cm

Solution

$l_{s} = 50 + l_{b} l_{s} α_{s} = l_{b} α_{b}$

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