# NCERT Notes for Class 12 Physics: Important Topics

There are 15 chapters in the CBSE Class 12 Physics textbook. We have provided class 12 CBSE notes for all physics chapters. These notes will be constructive in preparing for the whiteboard exam. This Grade 12 Physics Notebook will also help you quickly review and review this chapter. Students can quickly become familiar with important points and formulas by reviewing these CBSE Physics Notebooks for Grade 12.

Students have access to all 12th-grade physics notes that provide detailed step-by-step answers to all topics based on up-to-date syllabi and guidelines. Students are encouraged to download these notes and practice a few times to prepare well for the exam.

NCERT notes for 12th Physics, here is a list of important topics in the textbook.

# NCERT Notes for Class 12 Physics: Points to Remember

We have provided some very important points from 12th NCERT Physics for students to refer to.

• There are two types of charges in nature; positive charge and negative charge. Like charges repel each other and unlike charges attract each other.

• In conductors, electric current is due to the movement of electrons through them, in insulators, electric current cannot flow.

• (i) Coulomb’s Law: The mutual electrostatic force between two point charges q1 and q2 is proportional to the product q1q2 and inversely proportional to the square of the distance r21 separating them.

• There are two poles; the north pole and the south pole. Like magnetic poles repel and unlike ones attract.

• Magnetic monopoles do not exist. If you slice a magnet in half, you get two smaller magnets.

• The average power loss over a complete cycle is given by P=VI cosÏ•. The term cosÏ• is called the power factor.

• Maxwell found an inconsistency in Ampere’s law and suggested the existence of an additional current, called displacement current.

• Metals have low resistivity (10−2 to 10−8 Ω m)

• Insulators have very high resistivity (1011Ω m−1 to 1019Ω m−1)

• Reflection is governed by the equation ∠i=∠r. Angles of incidence and reflection are i and r, respectively.

• The incident ray, reflected ray, and normal lie in the same plane.

• The phenomenon of refraction of light could not be explained by the corpuscular model of light proposed by Newton, but it was successfully explained by the wave nature of light proposed by Huygens.