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Which risk increases when sustained high current passes through solid ionic conductors?

A)Dendrite formation causes internal shorting
B)Increased grain boundary electron tunneling
C)Increased thermal phonon propagation velocity
D)Reduced redox reaction polarization

💡 Explanation

Dendrite formation increases dramatically at high currents because electromigration drives metal ions across the electrolyte via ionic conduction; therefore, internal shorting becomes likelier rather than altered electron/phonon transport or polarization effects.

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