19. Advance Illustration | Current Electricity | Equivalent Resistance of an Infinite Grid

The website, aimed at nurturing grasping power students, has classroom lectures on almost all the topics. It is an outcome of 23-year long toil of Physics expert who has made it a mission to simplify the complexities of Physics.

Ashish Arora, the brain behind this interactive unique website, has all his lectures available on web for free of cost. He has created a youtube channel in the name of Physics Galaxy. Today more than 6000 video lectures are being watched per day on this website which is highest among any other e-learning website in India. Till now more than 3.6 Million videos are watched on it. On each video subtitles are also available in 67 languages using google translator including English, Hindi, Chinese, French, Marathi, Bangla, Urdu and other regional and international languages.

Besides uploading transcripts of all his videos, he has created a software based synchronized European voice accent of all videos to benefit students in USA, Europe and other countries.

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[markcavendish]

Best solution to this Irodov problem on whole of you tube.

[physicsgalaxyworld]

@Ayush, superposition theorem is a std theorem which we use commonly... I have not given derivation/proof of theorem here but you can do it yourself or follow the book David Griffiths or BL Thereja on Electromagnetism...

[ayylajaadu]

Sir your book is tremondously helpful and self explanatory

[geniusAyushPateria]

How can you use this superposition thing? What's the proof?

[shramanshraman]

for same problem how to find equivalent resistance between two opposite corners of smallest square sir

[parthbhosle]

Sir, Why to not add pd of batteries while superimposing ?

[karanbania]

Sir How can current flow from A to B if B is open?

[neelimajunnarkar]

I just didi not consider the second case and did not superimpose so got my ans as I/4 .Understood my mistake and also a genuine approach 🙏

[Phy_RNJ]

Sir what will be equivalent resistance if resistance connected directly between A and B is removed.

[chennakeshava]

Sir, in the first two cases, why do we need to ground one of the terminals of the battery? also in the first case if B is not kept open, then how will the current through AB change? Couldn't we still use the superposition theorem ?

[aarshverdhen]

so sir, can we apply this superposition principle in any case??

[surajmishra-tduy]

sir, what if resistance A and B is removed then what will be equivalent resistance between two points. A and B??

[ঋতভাষমল্লিক]

Sir concept is clear .. can any of the viewers tell what pen sir is using ?

[KaranDoshicool]

Sir if we considered +v volt at point a and 0 at point b and in case 2 we considered 0 at point a and -v at point b.then after superposition voltage at a is v+0 and voltage at b is 0-v.therefore pd is 2v?what's wrong

[gourishankar]

thank you sir for such a clear explaination

[prathamsharma]

This was the same question my physics teacher put in the test of class 10 (Olympiad based test )

[akashverma]

Current require return path, where is return path in both cases.

[yuvrajcharan]

Sir I the similar case if I have sequence of infinite resistance in infinite shape can we use this theorm

[prydin]

How can you talk about currents in an open circuit? Seems fishy!

[archia]

Same question is asked in my coaching FTS