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Magnetic circuits
To see how this is used in practice, consider a coil of N turns wound onto a closed ring shaped former with a very high
(note: r (steel) = 2000, r (silicon iron) = 7000, r (nickel) = 600).
A current I amps is passed through the coil, creating a magnetic field H within the former. The flux density is
webers/m2 and the flux is B.A ,where A i the area of the core. The flux density is mainly confined within the core because the core has a much larger than air. ( r>>1). Provided this is the case, then the flux density outside the core may usually be neglected in comparison.Because of its high , the former effectively 'guides' the flux around the loop in a similar way to current being guided around an electrical circuit by a high conductance (low resistance) wire.
Atoms with four valence electrons are good conductors. This statement is true or false. Ans: Atoms are good conductors with four valence electrons. This statement is false.
(a) Consider the following transmission line with the reactance X1 placed across the input. It is being driven with a frequency ω such that the length of the line is λ/4. W
An oil-filled transformer has a c.m.r. of 500 kVA which allows it to run continuously in an ambient of 35°C with an oil temperature rise of 50°C. The transformer has a time constan
Q. Explain the theory of thermal runaway? The maximum average power Pdmax which a transistor can dissipate depends upon the transistor construction and may lie in the
y more number of resistance and capacitor are used in a circuit what is the purpose to add ore than one..?
Q. What is Segment displays? Seven-segment displays are the most commonly used numeric display devices, while 10- and 16-segment (starburst) display devices are also available.
Unconditional Jump JMP ( Unconditional Jump ) Instruction: This instruction is used to transfer the execution to the specified memory address unconditionally ( does not c
what are the significance of solid state devices in electrical engineering
Q. If an analog message that has a spectral extent of 15 kHz is sampled at three times the Nyquist rate, determine the sampling rate.
a) A 230 V/25V, 50 HZ transformer with a rated primary current of 1,2 Amps is used to supply a number of 25 V, 30 Watt halogen light bulbs. Assuming an ideal transformer and tha
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