Why do phone screens respond to touch?
Show answer & explanation
Answer: Finger disrupts electric field
Finger disrupts electric field ✓ — Correct! Modern phones use capacitive touchscreens. Your finger's electrical properties disrupt the screen's electric field at that spot. The phone detects exactly where you touched. That's why gloves don't work—they block electrical contact!
Pressure sensors detect taps — Wrong. Most phones don't use pressure sensors for touch. Capacitive screens detect electrical field changes.
Skin oils trigger response — Wrong. Oils don't trigger the screen. Your finger's electrical conductivity is what's detected.