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← ScienceWhich outcome occurs in a bimetallic strip when heated above its designed temperature limit?
A)Mechanical failure from exceeding yield strength✓
B)Electrical short from insulation breakdown
C)Material crystallization from rapid cooling
D)Corrosion acceleration from chemical reaction
💡 Explanation
When heated excessively, differential thermal expansion causes stress beyond material yield strength, resulting in plastic deformation because the difference in expansion coefficients induces high stress. Therefore mechanical failure results, rather than electrical shorting, crystallization, or accelerated corrosion which require different triggering conditions.
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