# Electromagnetic Induction And Alternating Current Notes Pdf

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Electromagnetic induction is a phenomenon in which the rate of change of flux through a coil causes an induced emf.

First Law: When magnetic flux linked with the conductor changes, induced emf produces across it. Second Law:. The magnitude of the induced e. The direction of induced current or the polarity of the induced e.

## Electromagnetic Induction and Alternating Current: Alternating Currents and Voltages

Notes for Electromagnetic Induction chapter of class 12 physics. However, magnetic flux is a real physical quantity. The flux will be maximum, if , i. If the area lies along the direction of i. Consider a cylinder of radius R placed in a uniform field , as shown. The flux for the right-hand end surface is But for the left-hand end surface, it is. In , Oersted discovered that an electric current produces magnetic field.

## CBSE Class 12 Physics Electro Magnetic Induction And Alternating Currents Notes

Many applications are found using electromagnetic induction, including electrical components such as inductors and transformers, and devices such as generators and electric motors. Two different phenomena are described by Faraday's law: the transformer EMF which is generated by an electric force due to a changing magnetic field due to the differential form of the Maxwell—Faraday equation and the motional EMF generated by a magnetic force on a moving wire see Lorentz force. In , James Clerk Maxwell drew attention to the separate physical phenomenon. This is a unique example in Physics where such a fundamental law is invoked to explain two such different phenomena. It was noticed by Albert Einstein that the two situations corresponded to a relative movement between a conductor and a magnet, and the outcome was unaffected by which one was moving.

Doorsteptutor material for AIIMS Physics is prepared by world's top subject experts: fully solved questions with step-by-step explanation - practice your way to success. It is the phenomenon of production of e. The e. SI unit of magnetic flux is weber. The magnitude of induced emf is proportional to the rate of change of magnetic flux.

## JEE Main Electromagnetic Induction and Alternating Current Revision Notes

Youtube - Hindi. The generation of alternating currents ac is based on the phenomenon of electromagnetic induction. Whenever the magnetic flux changes an emf will be induced in the coil. AC generator is a device that converts mechanical energy into electrical energy alternating currents. AC generator is an example of inducing an emf or current in a loop by varying the magnetic field and area vector.

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### Chapter Notes: Electromagnetic Induction & Alternating Current Class 12 Physics

Doorsteptutor material for UGC Public-Administration is prepared by world's top subject experts: fully solved questions with step-by-step explanation - practice your way to success. A current whose magnitude changes continuously and direction changes periodically, is said to be an alternating current. C circuit. The instantaneous value of the current is given by the instantaneous value of the potential difference across the resistor divided by the resistance. It represents the maximum value of the current in the circuit. Fig shows a capacitor connected to an ac source.

There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects. Such currents are called eddy currents. They dissipate energy as heat which can be minimized by laminating the conductor.

ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS. • The phenomenon of production of induced emf in a conductor when electric flux linked.

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Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. Magnetic flux is a scalar quantity and its SI unit is Weber Wb. According to Lenz law, the direction of induced current or the polarity of the induced e. Lenz law obeys the principle of energy conservation.

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