Unveiling the Characteristics of Solenoids: Key Features and Applications

Solenoids are an essential component in electromechanical systems, with unique characteristics that make them ideal for various applications. In this article, we'll explore the key features and applications of solenoids, so you can gain a deeper understanding of their capabilities.

1. What is Solenoid-

A long tightly wound helical wire of insulated metallic wire is called solenoid. 

2. Properties of solenoid-

Fig 2.a
(Parallel magnetic field lines)

Fig 2.0
( Magnetic field similar to bar magnet)

                                                                                                        

Magnetic Field of a Solenoid (2.b)

 

If we pass an electric current through the Coil a magnetic field is created as shown in the image (2.0). 

    a. The pattern of the magnetic field is similar to that of a bar           magnet.

    b. Mangetic field lines are almost parallel inside the solenoid.         and it is directed from South pole to North pole inside the            Solenoid, shown in the image (2.a).

    c. Magnetic field direction of solenoid outside the solenoid is            from North pole to South pole. shown in image (2.b).

(3.0)

3. How to Find North and South pole of a Solenoid ?

  a. At a circular end of a Solenoid if the current flows in the anticlockwise direction then that end is North pole. It can be remembered with the help of symbol shown in image (3.0), which resembles letter 'N' of capital alphabet.

    

(3.a)

  b. At a circular end of a Solenoid if the current flows in the clockwise direction then that end is South pole. It can be remembered with the help of symbol shown in image (3.a), which resembles letter 'S' of capital alphabet.

4. Strength of the Magnetic field inside the solenoid.

    Strength of the magnetic field inside the Solenoid increases if     the current flowing in the solenoid increases.

       B (Magnetic field Strength) ∝ I  (Current).

     Strength of the magnetic field inside the Solenoid increases if      the no. of turns per unit length increases.

      B (Magnetic field Strength) ∝ n (number of turn per unit length).

      By combining above two factors magnetic we get - 

      B (Magnetic field Strength) ∝ n I (number of turn).

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