JEE Main 2022 · 25 Jul · Shift 2 · Physics Q40

PhysicsSingle correct+4 / -1Question 40 of 90

When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on :

Electromagnetic induction

Resonance in ac circuits

Mutual induction in ac circuits

Interference of electromagnetic waves

Answer and worked solution

Official answer: B

Metal detector is a resonant LC circuit; the metal shifts the resonance and triggers the alarm (NTA's key).

(B)

Topics:LCR circuits and resonance

JEE Main 2022 · 25 Jul · Shift 2, Physics question 40