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← ScienceWhich outcome occurs when a bimetallic strip inside a thermostat is heated beyond its designed temperature range?
A)Increased electrical resistance in circuit
B)Permanent deformation of the strip✓
C)Reduced sensitivity to temperature changes
D)Faster switching between states
💡 Explanation
When heated beyond its designed range, the bimetallic strip undergoes plastic deformation because differential thermal expansion exceeds the material's elastic limit, leading to permanent bending. Therefore, permanent deformation results, rather than increased resistance, reduced sensitivity, or faster switching, which require different failure modes.
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