Chapter: Magnetic Effects of Electric Current
video
video drop box
Video Parts
video

video

video

Magnetic effect of electric current is one of the major effects of electric current in use, without the applications of which we cannot have motors in the existing world. A current carrying conductor creates a magnetic field around it, which can be comprehended by using magnetic lines of force or magnetic field lines. The nature of the magnetic field lines around a straight current carrying conductor is concentric circles with centre at the axis of the conductor. The direction of the magnetic field lines of force around a conductor is given by the Maxwell’s right hand grip rule or the right handed cork screw rule. The strength of the magnetic field created depends on the current through the conductor. If the conductor is in the form of a circular loop, the loop behaves like a magnet. If the current in the loop is in the anticlockwise direction, a north pole is formed and if the current is in the clockwise direction a south pole is formed.
Electromagnetism created a revolution by leading to the devices called motors which convert electrical energy to mechanical energy. Experiments by scientists like Oersted and Faraday made a long leap by converting mechanical energy to electrical energy. When a straight conductor is moved in a magnetic field an electric current is induced in it and the phenomenon is electromagnetic induction. The emf caused is the induced emf and the current is induced current. Oersted found the same by relative motion of a magnet with respect to a coil. Faraday's experiment proved that the strength of the induced current depends on several factors like the strength of the magnet, the speed of motion of the magnet, its orientation, the number of turns in the coil and the diameter of the coil. The induced current can be detected by a galvanometer.
Electric generators work on the same principle. They have an armature which is free to rotate in a magnetic field. Its terminals are connected to two slip rings, which are further connected to two brushes and they are connected across a load resistance through which the generated electricity can be trapped. The rotation of the armature in the magnetic field changes the magnetic flux in the coil of the armature and an electric current is induced. For every half rotation, the direction of the induced changes and hence called alternating current.
View NCERT Solution
Educationkranti provides Chapter-wise tests and full-course Model Papers for each subject will help you gain more than enough practice before exams. Take an online test and test your concepts covered in our video lesson. It will be conducted in real time, helping you prepare more effectively for real tests. These papers are designed by Educationkranti experts to ensure availability of standardized tests for every student.
  • Chapter-wise tests to help you assess your preparation status after studying a chapter.
  • Detailed solutions for all the tests help students compare their solutions with model answers provided.
  • Unlimited tests for extensive practice.
Take a test
Highlights of important concepts in a chapter, written in easy language serve as valuable notes for use during the revision sessions before exams. These crisp revision notes along with key diagrams & illustrations help save valuable time and reinforce concepts already studied in the chapter.
  • Notes are organized chapter-wise for quick and easy reference.
  • Available in easily downloadable PDF format for easy downloading and printing.
  • High-quality illustrations and supporting diagrams aid in quick understanding.
  • Point-wise summary of key concepts in a chapter to ensure that you cover all topics.
  • Textbook revise are available in PDF format for easy download and printing.
  • Concepts are explained in easy language accompanied with high-quality graphics.
View revision notes