Question

A solenoid is a coil of insulated or enamelled wire wound on a rod – shaped form made of solid iron, solid steel, or powdered iron. State whether this statement is true or false.

Answer 1

Hint: A solenoid is defined as a coil of wire which acts as an electromagnet when an electric current is passed through it, it is often used to control the motion of the metal objects. An electromagnet is known as a type of magnet in which the magnetic field is produced by an electric current.

Complete step by step answer:
A solenoid is known as a coil of wire which acts as a magnet when an electric current flow through it. Let us take an example of a solenoid, for a better understanding of the concept.
In this solenoid, the wire is wound in the form of helix with a very small gap between two consecutive turns. The wires are enamelled which helps them to remain insulated from each other, his results in a closed circular loop. Thus, a magnetic field is generated which is equivalent to that generated by a circular loop.

From the figure, we can see that the magnetic field inside a solenoid is uniform in nature and is along the axis of the solenoid. The magnetic field at the exterior point of a current carrying solenoid is very weak.
A current carrying solenoid is a coil of insulated or enamelled wire wound on a rod – shaped form made of solid iron, solid steel, or powdered iron. The devices are used as electromagnets or as inductors in electronic circuits. When the current flows through the coil, most of the resulting magnetic flux exists within the core material.
Hence, the given statement is true.

Note:
A toroid is known to be shaped like a solenoid which is bent into a circular shape into a loop – like structure. It is a hollow circular ring, with many enamelled wires which are closely wound with negligible spacing between two consecutive turns.