Electrical circuits lecture notes b. Tech

 
HOW TO INCREASE EMF INDUCED IN A COIL:
 
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By increasing the number of turns in the coil i.e. N, from the formulae derived above it is 
easily seen that if number of turns in a coil is increased, the induced emf also gets 
increased. 
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By increasing magnetic field strength i.e. B surrounding the coil- Mathematically, 
if magnetic field increases, flux increases and if flux increases emf induced will also get 

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ELECTRICAL CIRCUITS 
 
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MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY 
increased. Theoretically, if the coil is passed through a stronger magnetic field, there will 
be more lines of force for coil to cut and hence there will be more emf induced. 
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By increasing the speed of the relative motion between the coil and the magnet - If the 
relative speed between the coil and magnet is increased from its previous value, the coil 
will cut the lines of flux at a faster rate, so more induced emf would be produced. 
APPLICATIONS OF FARADAY'S LAW:
Faraday law is one of the most basic and important laws of electromagnetism. This law finds its 
application in most of the electrical machines, industries and medical field etc. 
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Electrical Transformers work on Faraday's law of mutual induction. 
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The basic working principle of electrical generator is Faraday's law of electromagnetic 
induction. 
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The Induction cooker is a fastest way of cooking. It also works on principle of mutual 
induction. When current flows through the coil of copper wire placed below a cooking 
container, it produces a changing magnetic field. This alternating or changing magnetic 
field induces an emf and hence the current in the conductive container, and we know 
that flow of current always produces heat in it. 
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Electromagnetic Flow Meter is used to measure velocity of certain fluids. When 
a magnetic field is applied to electrically insulated pipe in which conducting fluids are 
flowing, then according to Faraday's law, an electromotive force is induced in it. This 
induced emf is proportional to velocity of fluid flowing. 
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Form the bases of Electromagnetic theory; Faraday's idea of lines of force is used in well 
known Maxwell's equations. According to Faraday's law, change in magnetic field gives 
rise to change in electric field and the converse of this is used in Maxwell's equations. 
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It is also used in musical instruments like electric guitar, electric violin etc.