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My university has replaced Electrostatics in our syllabus with Geophysics. So I am currently self-teaching Electrostatics using Griffith's Introduction to Electrodynamics (3rd edition).

Now, I was able to solve almost all of the "in-line" problems from the book in chapters 1 (Vector Analysis) and 2 (Electrostatics). I could solve only 1 out of 9 end-chapter problems for 1st chapter. Looking at this performance, I never even glanced at the end-chapter problems of subsequent chapters (I am currently on chapter 4)

But from chapters 3 (Special Techniques) and 4 (Electric Fields in Matter), I have been unable to solve "all" of the in-line problems (I could solve like 3 in 7 problems). However, I do understand what I was doing wrong in most of the in-line problems I fail to solve by reading the solution manual which is easily available online.

My method is to first attempt a problem and verify my solution from the solution manual.

It is worrying me that I am unable to solve "all" problems from chapters 3 and 4. Am I learning Griffith's E&M correctly? I needed some advice regarding this.