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Which effect occurs when a high-frequency electromagnetic field is applied to a dielectric material within a microwave oven?

A)Resonant molecular rotation and heating
B)Electron tunneling through energy barriers
C)Nuclear fission within the molecular structure
D)Paramagnetic alignment of atomic nuclei

💡 Explanation

When exposed to a high-frequency electromagnetic field, polar molecules within a dielectric material undergo dielectric heating through resonant molecular rotation because the electric field component aligns and realigns the molecules. Therefore resonant molecular rotation is induced, rather than tunneling, fission or alignment, which require substantially different systems or conditions.

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