4.2 Mutual Inductance + Example 4-1 (Example 13.1 (book)) + Example 13.2 (book) (الطريقة الأولي)

4.2 Mutual Inductance + Example 4-1 (Example 13.1 (book)) + Example 13.2 (book) (الطريقة الأولي) - si-manual