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Question

When a rod is heated from 25 C to 75 C, it expands by 1 mm. When a rod of same material but with 4 times the length is heated from 25 C to 50 C. The increase in length is

A
1mm
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B
1.5mm
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C
1.6mm
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D
2mm
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Solution

The correct option is D 2mm
Δl=l0αΔT

1mm=l0α50; Δl=4l0α.25

Δl=4×1mm50×25=2mm

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