A metal detector consists of a battery providing an alternating current to a transmitter coil and a receiver coil connected to a loudspeaker. Using Faraday's Law of Induction explain how a metal detector works. (5 marks)

The alternating current flows through the transmitted coil and produces a magnetic field around the coil. (1 mark) When the detector passes over a magnetic object, the magnetic field passes through the object. (1 mark) This creates a current around the object. (1 mark) This current induces another magnetic field opposing that of the transmitter coil, due to Lenz's Law. (1 mark) This magnetic field passes through the reciever coil, and as a result makes an electric current flow through the reciever coil and up to the loudspeaker. (1 mark)

MH
Answered by Mabast H. Physics tutor

3662 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

A child is going down a snowy hill on a sledge. Draw a free-body force diagram for the child and sledge.


State Faraday's Law of electromagnetic induction, both qualitatively and quantitatively. How is Lenz's Law included in this? (4 marks)


Given the Earth orbits the Sun at a distance of 1.49*10^11m with Me = 5.97*10^24kg and Msolar = 1.99*10^30, what is the gravitational force between the Earth and Sun?


What is the difference between electromotive force and potential difference?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences