Wireless charging and railway track: what they have in common

1. Step 1. Wireless charging — uses — Electromagnetic induction. Induction.
2. Step 2. Electromagnetic induction — is used in — RFID. The tag gets energy from the reader’s field.
3. Step 3. RFID — is used in — Turnstile. Contactless cards.
4. Step 4. Turnstile — is part of — Metro. Turnstiles.
5. Step 5. Metro — uses — Railway track. It runs on rails.

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