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ELECTRO MAGNETISM:
In this unit we learned about electromagnetism and the relationship that presents between and magnetic flux and electric current. The way in which electric current magnetizes a magnetic material was discussed in magnetization curve or B-H curve. In relation to B-H curve, phenomenon of magnetic hysteresis was also explained.
Magnetic circuit provides a path for magnetic flux and this is the basis of electromagnetism. Types of magnetic circuits which can be series or parallel were discussed.
A current carrying coil has self inductance and the inductance among two coils is called mutual inductance. We had elaborate discussion on these with instance. The coefficient of coupling among two coils find the degree of linking between their fluxes and it was studied.
Dot convention finds out whether e.m.fs between two mutually coupled coils are aiding or opposing and this was depicted with examples.
Series or parallel connection among two current carrying coils was explained. Series and parallel connection can again be aiding or opposing.
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y more number of resistance and capacitor are used in a circuit what is the purpose to add ore than one..?
Cite a specific example in which the engineer must provide maximum efficiency for a given cost
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deriving formula of the frictional force
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Draw an electrical relay diagram rung showing a N/O contact of CR1(coil) in series witha N/C contact of CR2(Coil), operating a lamp L1. A delay-on (TON) relay has a preset of 5.
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