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Which outcome occurs when applying excessive back-EMF, due to a sudden reduction in motor load, to a capacitor-shunted DC motor's circuit?

A)Capacitor dielectric breakdown becomes more likely
B)Increased motor efficiency at full charge
C)Reduced commutator arcing over time
D)Stabilization of motor brush contact

💡 Explanation

Capacitor dielectric breakdown becomes more likely because the excessive voltage surpassed the capacitor's voltage rating, leading to dielectric breakdown, therefore the component fails rather than benefiting motor performance or further stabilizing brushes.

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