"If we grasp the solenoid with our right hand so that our fingers follow the direction of the current in the winding's, then out extended right thumb will point in the direction of the axial magnetic field".Ĭlick here for the Video tutorials of Magnetic Effect of Current Class 12Ībout eSaral At eSaral we are offering a complete platform for IIT-JEE & NEET preparation. Its direction along the axis is given by a curled-straight right-hand rule. The 'uniform' magnetic field within a long solenoid is parallel to the solenoid axis. Just as a parallel-plate capacitor produces a uniform and known electric field, a solenoid produces a uniform and known magnetic field. It does not depend upon the length and area of the cross-section of the solenoid. If the solenoid is sufficiently long, the field within it (except near the ends) in uniform. Thus, the magnetic field at the ends of a 'long' solenoid is half of that at the center. If the observation point P is well inside a very long solenoid Let $x$ be the distance of the point $P$ from the centre $\mathrm\right)$. The number of turns in this coil is n\deltax. Let us imagine the solenoid to be divided up into a number of narrow coils and consider one such coil AB of width $\delta x$. Let $P$ be a point on the axis of the solenoid. Let n be the number of turns per unit length of the solenoid. Magnetic Field of a Solenoid Derivation Let there be a long solenoid of radius 'a' and carrying a current I.
The lines of force inside the solenoid are nearly parallel which indicates that the magnetic field 'within' the solenoid is uniform and parallel to the axis of the solenoid. The figure shows the lines of force of the magnetic field due to a solenoid. When an electric current is passed through the solenoid, a magnetic field is produced around and within the solenoid. It is made by winding closely a large number of turns of insulated copper wire over a tube of cardboard or china-clay. Magnetic Field of a Solenoid A solenoid is a long cylindrical helix. So here we will study in detail about Magnetic Field of a Solenoid Derivation in this article: In fact, a speaker and microphone are pretty much exactly the same things in reverse of each other.
Speakers and microphones both contain solenoids. You can hardly swing a bat without hitting a solenoid. Electromagnetic solenoids find use all over the world. The Solenoid is a coil of wire that acts like an electromagnet when a flow of electricity passes through it. For Class 10 th Boards + JEE/NEET Studentįor Class 9 th + 10 th + JEE/NEET Student
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