Imran on entering the airport was asked to remove the contents from his pant and shirt pockets; his hand bags and luggage were also checked by airport authorities by using a metal detector. Imran got annoyed and argued with the airport authority asking the reasons for such procedure. The authority tells him that all the passengers and their belongings will be checked for security check to ensure safe travel.
(a) What is the value that imparts us in the above scenario ?
(b) Briefly explain the working principle of a metal detector.
(a) Respecting law and obeying the rules enacted by the nation; self discipline and avoiding arguments.
(b) The change in the magnetic field in a metal detector due to the metals carried by the contents of checking which, induces the change in current in the coil of the metal detector. This .detection of change sets up an alarm.