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Chapter 26: Problem 12

Why is a piece of iron attracted into a solenoid?

Short Answer

Expert verified
A piece of iron is attracted into a solenoid because the magnetic field generated by the energized solenoid magnetizes the iron, causing it to be pulled towards the coil.

Step by step solution

01

Understand the properties of a Solenoid

A solenoid is a cylindrical coil of wire which acts like a magnet when an electric current passes through it. The magnetic field inside a solenoid is uniform, i.e., it has the same direction and magnitude at each point. This implies that it acts like a bar magnet and has South and North Pole.
02

Know the properties of Iron

Iron is a ferromagnetic material. It is attracted to magnets and can also be made into a magnet itself. When it comes in contact with a magnetic field, the electrons in the iron object will start to rotate and align their spin axis along with the direction of the magnetic field. This causes the object to become magnetized and therefore attracted to the magnet.
03

Unification of knowledge

When a solenoid is energized, it creates a magnetic field, which then magnetizes the iron object, leading it to be attracted towards the coil (solenoid). In this context, the solenoid acts like a magnet - attracting iron.

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Most popular questions from this chapter

The Biot-Savart law shows that the magnetic field of a current element decreases as \(1 / r^{2} .\) Could you put together a complete circuit whose field exhibits this decrease? Why or why not?

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