Metal detector works on the principle of
Metal detector works on the principle of
Ohm's law
Couloumb's Law
Electromagnetic induction
Stefan's law of radiation
The Correct Option is C
Solution and Explanation
The correct option is: (C): Electromagnetic induction.
A metal detector works on the principle of electromagnetic induction. This is because when a metal object enters the detector's electromagnetic field, it induces eddy currents in the metal. These eddy currents, in turn, create their own magnetic fields that oppose the original field. The resulting changes in the electromagnetic field are detected by the device, allowing it to identify the presence of metal objects. This phenomenon of electromagnetic induction is the foundation of how metal detectors can locate and identify metallic objects.
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter