Teaching UP TGT Mock Test Series 2025 Physics Thermal Properties of Matter Thermal expansion

The coefficient of linear expansion of iron is 12 × 10-6 per ∘C. Then the coefficient of thermal expansion of a spherical ball made of iron is

1
36 × 10-6 per ∘C
2
24 × 10-6 per ∘C
3
12 × 10-6 per ∘C
4
6 × 10-6 per ∘C
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