Question

while testing the working of an electromagnet,the current in the coil should be switched ON only for a few seconds at a time.Why?

Answer 1

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix.[1][2] Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as inductors, electromagnets, transformers, and sensor coils. Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely an external time-varying magnetic field through the interior of the coil generates an EMF(voltage) in the conductor.

Answer 2

bcoz electricity passes and makes the electromagnet magnetic till current is on and bcoz of that we can know it the electromagnet working correctly or not if yes then when the current will be off the electromagnet will get demagnetised..... HOPE U LIKE MARK AS BRAINLEIST PLZ