In Class 12 Physics, Lenz's Law is typically covered in the chapter on **Electromagnetic Induction**, which is usually Chapter 6 in most NCERT textbooks. This chapter discusses Faraday's laws of electromagnetic induction, Lenz's Law, and applications of electromagnetic induction, such as transformers and inductors. If you're using a different textbook, the chapter number may vary, but it will generally be within the section on electromagnetic induction.