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Railways PYQCBT 1 2016

RRB NTPC · Question 41

The metal detectors through which people pass through airports are operated by A. Civil laws B. Newton's law C. Faraday's law D. Coulomb's law

  1. D

  2. C

  3. A

  4. B

Show answer & explanation

Answer: (B) C

Explanation

Walk-through metal detectors work by electromagnetic induction: a metal object changes the magnetic field and induces currents, as described by Faraday's law.