Lecture 27: Capacitors & Inductors (Contd.)

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[@sridharchitta7321]

How do RC and RL filters function? How do capacitors and inductors drop ac voltages in filters?
To understand this intuitively it is useful to know what is a fringe field of capacitors and what its effect is at different frequencies. With inductors, it is useful to know the induced field and its effects at different frequencies. These effects influence the net field and current magnitudes in capacitors snd inductors.
Knowing this will help in understanding the operation of RL and RC circuits as filters. Attenuation, it should be understood, denotes a decrease of the amplitude, or magnitude of coherent or incoherent electromagnetic waves or electrical impulses without specifying what quantity should be used to measure the decrease, whether the decrease should be space-dependent, time-dependent or both, the cause of the decrease or, the conditions under which the decrease is to be measured.
A resistor can produce attenuation but it need not be there always to produce attenuation. Lossless lines and T-section and m-derived section filters can attenuate signals as well.
Electrostatics and circuits belong to one science not two. To learn the operation of circuits, Current and the conduction process, resistors, capacitors and inductors and how discussing these topics with a unified approach makes it easier to understand phase-shifting in capacitive and inductive circuits,
watch these two videos
i. ruclips.net/video/REsWdd76qxc/видео.html and
ii. ruclips.net/video/8BQM_xw2Rfo/видео.html
The last frame References in video #1 lists two textbooks 3 and 4 with topics that discuss the operation of capacitors and inductors. Textbook 4 in addition includes discussions on phase-shifting with a unified approach to electrostatics and circuits useful to understand how filters function.

[@anilrawat4858]

if capacitance value is different in ex. 5.8, will the energy still remains the half ?

[@chetanteli_iitbombay]

Doubt in example 5.8 ,are this capacitors are not in series after t=0...

[@keshavbassi6501]

Sir what would happen if in example 5.8, we consider both the capacitors to be ideal capacitors. We have seen in the video that ideal capacitors cannot dissipate energy. This implies that ideal capacitors cannot have parasitic elements since this would allow the ideal capacitor to dissipate energy. So, if the explanation in example 5.8 is correct, then this shows that ideal capacitors have parasitic elements, i.e., an ideal capacitor can dissipate energy.
Isn't it a contradiction?

[@rahulchhabra6443]

31:08

[@sridharchitta7321]

There are nice lectures here too with a *unified approach to electrostatics and circuits*
*Simple D.C. circuit.*
*1* Pattern of electric field.
Watch from *16.0 minute*.
*2* Mechanical Battery
Watch from *19.0 minute*.
ruclips.net/video/Eu3JQKrJRZA/видео.htmlsi=t3MeX8Hi8ELAxaz0
*3* First intro to *Surface Charge*
Watch from *10.30 minute.*
*4* Surface charge *gradient*
Watch from *15.30 minute.*
ruclips.net/video/bp0o1HZOs3g/видео.htmlsi=PPiPGepbXvdTgJHX
*Capacitor - Video lecture by NCS Univ faculty*
This is a link to a video lecture by NCSU faculty on the fringe field of a capacitor.
*Important*
*5*. Derivation leading to fringe field expression of a capacitor.
For the final expression of the fringe field watch from *15.0 minute* .
*ch15L3b*
ruclips.net/video/7rZ1uFc1ibE/видео.htmlsi=0a6OMk-kQLeEMMzb
The second link is to a video lecture by NCSU faculty on *Discharging and Charging of a capacitor*.
*6* . *Discharging a capacitor*
Watch from *3.0 minute.*
*Charging a capacitor*
Watch from *15.0 minute.*
*Ch19L1a*
ruclips.net/video/hnSC8MqgCjY/видео.htmlsi=krGUPtDarUmFxT_I
*Faraday's Law and self-induced emf*
This is a link to a video lecture by NCSU faculty on Faraday's Law.
*Important*
*7* . Faraday's Law
Watch from *8.0 minute.*
*Ch22L1a*
ruclips.net/video/ktGL5cEB82I/видео.htmlsi=u9vH33gaX1Wy5JvF
*8*. Non-coulomb electric field - curly-patterned fields
Watch from the *beginning.*
*Ch22L1b*
ruclips.net/video/nV6xg-OuxoY/видео.htmlsi=UjJBG3wDjazfeQMM
The second link is to a video lecture on *self-induced emfs in solenoids (inductors)* .
*9*. Self-induced emf in a solenoid
*Ch22L2a*
Watch from *10.30 minute.*
ruclips.net/video/RJ0J_TL-wUQ/видео.htmlsi=qPZ74uD-m6weyFlb
Refer *Fundamentals of Electric Theory and Circuits* by Sridhar.