Iit Jee Physics (1978 To 2018) Topic-wise Complete Solutions For Iit Jee With H C Verma Harish Chandra Verma Bharati Bhawan

IIT JEE PHYSICS (1978–2018: 41 Years) Topic-wise Complete Solutions Combined Volume Mechanics, Waves and Optics Heat, Electromagnetism and Modern Physics Jitender Singh Shraddhesh Chaturvedi PsiPhiETC 2018 ii Published by PsiPhiETC 116, Nakshatra Colony, Balapur Hyderbad 500005, Telangana, India. IIT JEE Physics c 2018 by Authors Copyright All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the authors. Request for permission to make copies of any part of the work should be mailed to: 116, Nakshatra Colony, Balapur, Hyderbad 500005, Telangana, India. The authors have taken care in preparation of this book, but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information contained herein. Typeset in TEX. Third Edition, 2018 2 Visit us at: www.concepts-of-physics.com We dedicate this book to the hundreds of anonymous professors at IITs who formulated the challenging problems for IIT-JEE. The book is a showcase of their creation. v Foreword Physics starts with observing the nature. The systematic observation results in simple rules which unlock the doors to the nature’s mystery. Having learned a handful of simple rules, we can combine them logically to obtain more complicated rules and gain an insight into the way this world works. The skill, to apply the theoretical knowledge to solve any practical problem, comes with regular practice of solving problems. The aim of the present collection of problems and solutions is to develop this skill. IIT JEE questions had been a challenge and a center of attraction for a big section of students at intermediate and college level. Independent of their occurrence as an evaluation tool, they have good potential to open up thinking threads in mind. Jitender Singh and Shraddhesh Chaturvedi have used these questions to come up with a teaching material that can benefit students. The explanations accompanying the problems could bring conceptual clarity and develop the skills to approach any unseen problem, step by step. These problems are arranged in a chapter sequence that is used in my book Concepts of Physics. Thus a student using both the books will find it as an additional asset. Both Jitender Singh and Shraddhesh Chaturvedi have actually been my students at IIT, Kanpur. Jitender Singh has been closely associated with me since long. It gives me immense pleasure to see that my own students are furthering the cause of Physics education. I wish them every success in this work and expect much more contribution from them in future! Dr. H C Verma Professor of Physics IIT Kanpur vii Preface This book provides a comprehensive collection of IIT JEE problems and their solutions. We have tried to keep our explanations simple so that any reader, with basic knowledge of intermediate physics, can understand them on his/her own without any external assistance. It can be, therefore, used for self-study. To us, every problem in this book, is a valuable resource to unravel a deeper understanding of the underlying physical concepts. The time required to solve a problem is immaterial as far as Physics is concerned. We believe that getting the right answer is often not as important as the process followed to arrive at it. The emphasis in this text remains on the correct understanding of the principles