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Introduction to Electromagnetic TheoryAbout the BookThe present book Introduction to Electromagnetic Theory is written under the CBCS pattern, followed all Indian Universities guided UGC. This book is the result of great attempts the authors to bring a balance between the mathematical framework and the conceptual development from the theoretical point of view. This text book will help the undergraduate students to build a solid conceptual base in the field of classical electrodynamics,
About the BookThe present book Introduction to Electromagnetic Theory is written under the CBCS pattern, followed all Indian Universities guided UGC. This book is the result of great attempts the authors to bring a balance between the mathematical framework and the conceptual development from the theoretical point of view. This text book will help the undergraduate students to build a solid conceptual base in the field of classical electrodynamics, which will help them to explore the beauty of man's thought process in this particular branch of physics. The ideas will help the engineering students to apply the different laws of this branch in different applications. The book is started with a brief introduction about the EM theory. In the first chapter, authors briefly discussed different mathematical tools and their relations with the many physical concepts used in the rest of the book. This first chapter is very important for the journey to the rest of the book. The second chapter starts with the Gauss’ law for electric fields, magnetic fields and then the Faradays law and Ampere's law in non-stationary states. The authors then discussed how Maxwell explored the incompleteness of the Ampere's circuital law and then make it modified to relate it with different electromagnetic phenomena occurred in nature. In this chapter, Maxwell's equations expressed both in the integral and differential forms are presented using different mathematical tools which were already discussed in the first chapter . In the third chapter, authors focused their discussions to the different laws of conservations which are obeyed the EM waves during its propagation in a medium. Fourth and fifth chapters are dedicated on the propagation of EM waves in unbounded and bounded media respectively. In chapters six and seven they presented the different EM phenomena observed in nature due to the anisotropy behavior of a medium. The content of the last two chapters are related to the brief introduction to two well established applications of EM theory, namely optical waveguide and fiber optics. Authors appreciate any kind of feedback from the students as well as from the experts of any discipline, whatsoever, about the book. About the AuthorsDr. Subhendu Panda is currently acting as Assistant Professor of Physics in CNCB Academy of Science and Technology, a Research based Self-financed degree Science College located at Jagatsingpur in Odisha, affiliated to Utkal University. Dr. Panda obtained his B.Sc. from Calcutta University and M.Sc. from Visva Bharati University, Santiniketan. He completed his Ph.D. work in Saha Institute of Nuclear Physics, Kolkata and awarded from Calcutta University. His area of research is Non-Linear Dynamics. During the Ph.D. he studied dynamics of non-linear lattices based on different prototype non-linear lattice models under the supervision of Prof. Tarun Roy and Prof. Avijit Lahiri. His post-doctoral research works are related to the continuation of his earlier works. All his research papers have been published in different reputed international journals like American Physical Society, Elsevier, World Scientific etc. He also co-authored some popular level newspaper articles on diversified science topics in some leading Indian dailies in recent times. He is an experienced teacher, teaching physics at the B.Sc. (Hons.) level over last 10 years.Dr. Priyadarshi Majumdar completed his Masters in Physics (Specialization in Electronics) and awarded Ph.D. in Physics (Nonlinear Dynamics) from the University of Calcutta. As Post-Doctoral Scientist he published about 40 International research papers. His other major research works are diversified in the fields of Condensed Matter Physics, Quantum Entanglement, Quantum Game Theory, Classical Gravity, Computational Biology, Bio-Statistics, Experimental Polymer Physics & Polymer Chemistry, Simulation & Modeling. His major research papers are published American Physical Society, American Institute of Physics, World Scientific, Elsevier, IOP, Springer, Chinese Chemical Society, World Academic Press, ICTP Publications, Institute of Theoretical Physics (India) and Calcutta Mathematical Society. His important research works were headlined News Rx, Medical News Article on Theoretical Biology and Vertical News, Physics Week, Information Technology Week. Dr. Majumdar is also an Academic Writer & Freelance Journalist and published about 65 popular level articles on different motivational topics in leading Indian English, Hindi, Bengali daily’s. He published 7 ISBN books so far on Electronics and other fields. Presently he is working as Assistant Professor and Head of the Department of Electronic Science at Barrackpore Rastraguru Surendranath College, Kolkata and Member of UG Board of Studies of Electronics of West Bengal State University, West Bengal. More CBCS ISBN text (theory & practical) books as well as some non-text books on Electronics are in press and expected to be published very soon. Apart from his academic activities he is a poet of rhythm and a leading balancing artist of the world.Shipping Notes
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★★★★★ 5
EUFY 11S
Size: 2+8 pack
Used to replace the ones for my EUFY 11S vacuum. They fit just like the ones and got my vacuum back to cleaning really good. Didn’t realize how loud my vacuum had become until I replaced these parts.
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Reviewed in the United States on December 19, 2025
★★★★★ 5
Get this!
Size: 3+12+12+2+1 pack
Very nice pack of essentials for my robot.
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Good Replacement Set
Style: 19 Pack
Good replacement set for the price. Parts are basically like the originals and are easily installed for a perfect fit for the 25C.
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Reviewed in the United States on July 11, 2025
★★★★★ 5
Rejuvenates your Robovac, but one caution
I was a little wary buying third-party aftermarket parts for my Eufy Robovac 30c, however, all the parts in this kit are virtually identical to OEM parts. I replaced all three brushes and all three filters and let it loose on my Golden Retriever-inhabited living room. I can honestly say the result was a 50% increase in the amount of fur collected. I suspect that over time there is a loss of performance so gradual that it's easy to not notice. I assume the new filters returned the vacuum power to it's original level of suction was a big factor.
When I was browsing through all the available choices here on Amazon, a plastic "ring" kept appearing in many of the product images, however, people did not know what it is for or simply did not get one in their shipment. If you look at the photos I've attached one can see that I did indeed get one and figured out its purpose, to remove fur and/or hair from the horizontal brush.
The bottom line is that I would definitely buy this item again.
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EDIT, four weeks later: Since replacing the main roller brush with the one included with this product, I have experienced several “Roller brush is stuck” shutdowns and alerts. In each case, there has been nothing tangled in the brush and the brush was free to spin. I have to say it’s quite annoying to come home expecting the floor to be cleaned but only to find this error long before the job was finished. Today it gave this error twice in one cleaning cycle. I never experienced this problem with the OEM roller brush.
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Reviewed in the United States on September 8, 2019
★★★★★ 5
Euphy works good as new!
Style: 19 Pack
As soon as I opened the package everything looked the same- pre-filters, filters, main brush, and side brushes. I changed the big brush first;the only issue was the new brush body didn't have the white arrows to help aligning but that didn't affect how the brush worked. I changed filter and pre-filter, and finally the side brushes.
When I turned on my "Goophy" and tried to let her run the side brushes were a little too (Goophy's side brushes sounded a little louder). I trimmed the side brushes a little and all was well. Goophy didn't want to run herself but it didn't take long for me to figure out it wasn't the new brushes ;just the operator pushing the wrong button. My Goophy Euphy did what she was supposed to do- vacuum the carpet and tile floor. Goophy Euphy still wanted to take the long way to her charging station which was nothing new and easily corrected.
Over all the new brushes and filter restored Goophy Euphy back to when we first used her!
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Reviewed in the United States on July 22, 2023