Class 12th Physics Electrostatic Potential and Capacitance. NCERT Notes CBSE 2023

# Chapter 2 Electrostatic Potential and Capacitance

The second chapter of Grade 12 Physics deals with electrostatic potential and capacitance. These NCERT notes are designed according to the latest scheme. This is one of the most valuable resources for students that will help revise entire chapters in no time. Therefore, these NCERT notes can be very helpful when preparing for exams.

Chapter 2 Physics class 12 of CBSE is about electrostatic potential, potential energy due to a point charge, and potential energy due to a system of charges and equipotential surfaces. Students taking the 12th-grade board exam should focus on practicing the questions in the text given on Vidyakul. This will help students prepare well for the exams and eventually pass them. In the article below, we have listed important ways to solve NCERT Physics Chapter 2 for students to practice closely.

### Points to Remember

• Electrostatic Force is a conservative force.

• Potential at a point is the work done per unit charge (by an external agency) in bringing a charge from infinity to that point. Potential at a point is arbitrary within an additive constant since it is the potential difference between two points that is physically significant.

• An equipotential surface refers to the surface on which the potential will have a constant value.

• The electrostatic field will be zero in the interior of a conductor.

• The capacitor refers to the system of two conductors which is separated by an insulator.

### Topics and Sub-topics

The Electrostatic Potential and Power chapter is one of the most interesting and fun chapters in Grade 12 Physics. Although you may find the concept a bit difficult to grasp at first, once you start practicing the sentences. Ask, and everything will become much easier. Needless to say, it's going to be a bumpy road and you'll soon be a pro at electrostatic potential and capacity.

 Section Name Topic Name Description 2.1 Electric Potential 2.2 Potential Due To A Point Charge 2.3 Potential Due To An Electric Dipole 2.4 Equipotential Surfaces 2.5 Relation Between Field and Potential 2.6 Potential Energy Of A System Of Charges 2.7 Potential Energy In An Extended Field 2.8 Electrostatics Of Conductors 2.9 Dielectrics And Polarisation 2.10 Capacitors And Capacitance 2.11 Parallel And Spherical Plate Capacitor 2.12 Effect Of Dielectric On Capacitance 2.13 Combination Of Capacitors 2.14 Energy Density In Electric Field 2.15 Energy Stored In Capacitor

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### Few Important Questions

• An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then what would be the net force acting on it and its potential energy?

If its dipole moment is along the direction of the field, the net force acting on it is zero and its potential energy is minimum.

• If E is the electric field intensity of an electrostatic field, then the electrostatic energy density is proportional to?

Electrostatic energy density is proportional to E2.

• If a charged body is placed near a neutral conductor, then how it will impact the conductor?

In order to maintain the conductor neutral, an exactly equal amount of opposite charge will appear on the opposite surface of the conductor. Thus attractive forces will dominate and charged body will attract the conductor.

### Practice Questions

1. A spherical conductor has a charge of 4 × 10–8C distributed uniformly on its surface of radius 15 cm. Calculate the electric field just outside the sphere and at a point 15 cm from the center of the sphere.

1. Find out the capacitance if the distance between the plates is reduced by half and the parallel plate capacitor has a capacitance of 20 pF (1pF = 10-12 F) with air between the plates.

2. What is the total capacitance of the combination Three capacitors each of capacitance 20 pF are connected in series.