The long wire that is wound in the form of the helical coil is termed as the solenoid. Commonly, the solenoids are used in the experimental research where there is the involvement of the magnetic field. The winding of the solenoids is much easier, the magnetic field at its center is quite uniform and is directly proportional to the current that is contained in the wire. Both the straight and toroidal solenoids have applications in various fields all across the world. They are used in the water pressure valves, in the air conditioning systems, locks of the hotel doors, MRI machines, microphones, speakers, cars, and power plants.
Description
When the charge sits idle as it is lazy enough to move then it is surrounded by the electric field. Once the charge gets enthusiasm and starts running around then all of a sudden it starts producing the magnetic field. The solenoid is the long and straight coil of the wire that can be used for the generation of the nearly uniform magnetic field, similar to the magnetic field of a bar magnet. Such coils are known as solenoids. By the addition of the iron core, the field can be greatly strengthened. Such cores are the typical parts of the electromagnets.
In the center of the long solenoid, the magnetic field is nearly concentrated in the uniform field. The field outside of the solenoid is weaker as the lines which are representing the magnetic field are further apart. The solenoids have the length of the insulated wires that are coiled into the cylindrical shape. A stronger magnetic field is produced due to the current in the solenoid. As compared to the outside the magnetic field is stronger in the inside conditions.
In the above region, the field lines are parallel and are closely spaced which shows the high uniformity in the direction and strength of the field. The field lines outside the solenoid are much similar to that of the bar magnet and it also behaves in the same way, as if it had the south pole at the one end and north pole at the other end. With an increase in the distance from the solenoid, the strength of the field is diminished.However, in the solenoid, the strength of the magnetic field can be increased by increasing the coil’s current, by increasing the coils in the solenoid, and by the use of the soft iron core in the solenoid. By reversing the direction of the current, the direction of the magnetic field is also reversed.
