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Which outcome arises when magnesium oxide (MgO) is stressed?

A)Crystalline grains slide along slip planes.
B)Electrons tunnel through the energy barrier.
C)Debonding occurs with hydroxyl formation solely.
D)Fracture occurs with surface charge separation.

💡 Explanation

Fracture surfaces exhibit charge separation because fracturing MgO breaks ionic bonds, leaving an imbalance. Therefore, the fracture creates charged surfaces, rather than grain sliding which relates to yielding or electron tunneling, which requires a barrier.

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