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← ScienceWhich outcome results when a high-frequency square wave is applied to a capacitive touch screen?
A)Screen flickering due to rapid charge-discharge
B)Reduced sensitivity from dielectric polarization
C)Increased accuracy from higher SNR
D)Local heating from parasitic resistance✓
💡 Explanation
When a high-frequency square wave is applied, dielectric losses from parasitic resistance in the capacitive touchscreen cause energy dissipation via resistive heating. Therefore local heating results rather than flickering, reduced sensitivity or increased accuracy; these require different conditions on the touchscreen.
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