Hi all,
The question is as follows:
The book answer is as follows:

The question is as follows:
The book answer is as follows:

Below is my attempt to solve the same question however, it doesn't match the answer shown in the book. Kindly advise me of my mistake.

SOURCE: Study Guide for Fundamentals of Engineering (FE) Electrical & Computer CBT Exam Third Edition, By Wasim Asghar, ISBN:9798670880909
The question is as follows:

The book answer is as follows:

The question is as follows:

The book answer is as follows:


Below is my attempt to solve the same question however, it doesn't match the answer shown in the book. Kindly advise me of my mistake.

SOURCE: Study Guide for Fundamentals of Engineering (FE) Electrical & Computer CBT Exam Third Edition, By Wasim Asghar, ISBN:9798670880909