Electromagnets
There is a cozy connection between electric flow and attraction. Let us play out a movement to comprehend the connection between electric flow and attraction.
Practical
• They will be pulled in by the nail and stick to it as appeared in the figure.
• Now open the key again and see what occurs with the iron clasps?
• All the iron clasps will tumble from the nail. What do you finish up from this practical?
From the above practical, we see that when an electric flow goes through a wire twisted around the nail, the nail begins to pull in the iron clasps. In this way we can infer that:
Electromagnet
An iron nail or a rod turns into a magnet when electric flow goes through the loop twisted around it. Such a magnet is called electromagnet.
An electromagnet is a transitory magnet. It remains magnet as long as the current goes through it yet when the current is turned OFF it loses its attractive impact.
Electromagnets applications
Electromagnets attract the objects made of iron, nickel and cobalt They are utilized broadly in our every day life. For instance, they are utilized in magnetic locks, circuit breakers, and uproarious speakers, and so forth, Electromagnets are likewise utilized in magnetic cranes, electric chimes, electric engines and so on.
i. Electromagnetic Crane
Have you at any point seen electromagnetic cranes working in a scrap yard? In electromagnetic cranes, electromagnet is utilized for lifting overwhelming iron piece. These cranes get metal piece by turning the magnet ON. To discharge the piece, the electromagnet is turned OFF.
ii. Electric Bell
Electromagnet is utilized in the electric ringer. At the point when the switch is turned ON, a current beginnings moving through the loop around an iron rod. It
becomes electromagnet and subsequently draws in the versatile iron strip (called armature) towards itself. The hammer which is connected to the armature
strikes the gong of the ringer and sound is formed. At the moment electric circuit breaks and the current flow quits moving through the loop. The loop no longer remains electromagnet, the armature moves back and finishes the circuit once more.
A similar activity is rehashed and the mallet/hammer keeps
on striking the gong as long as the switch is kept ON.
iii) Magnetic Compass
We realize that compass is an instrument containing an openly suspended magnetic needle which consistently focuses in North-South direction.lt is a navigational instrument which is utilized for discovering directions.
Do you know?
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