# Xam Idea Class 12 Physics Chapter 2 Solutions: Electrostatic Potential And Capacitance

Xam Idea Class 12 Physics Solutions for Chapter 2 ‘Electric Potential and Capacitance’ is a perfect guidebook for CBSE Class 12 board exams. These solutions give you detailed knowledge of potential difference and energy, capacitors, the energy density of capacitors and charged and uncharged capacitors. You will be able to find equivalent capacitance, equipotential surface, dielectric constants, the charge on a capacitor easily with the help of our solutions.

Xam Idea Solutions for Electric Potential and Capacitance include 98 questions that are categorised into 4 types. This includes VSAQ (Very Short Answer Type Questions), SAQ – I (Short Answer Questions – I), SAQ-II (Short Answer Questions – II), LAQ (Long Answer Questions). These questions also cover the CBSE previous year questions that will be immensely helpful for your Class 12 board exam preparation.

Xam Idea solutions for Class 12 Physics Chapter 2 Electric Potential and Capacitance is a remarkable guide by our subject matter experts. These solutions would make you capable of solving the most complex Physics problems in an easy way and in the shortest time frame. All our solutions adhere to the latest CBSE Class 12 Physics syllabus and exam pattern. They will definitely help you enhance your problem-solving skills.

## Important Topics for Xam Idea for Class 12 Physics Solutions Chapter 2: Electric Potential and Capacitance

The thorough ideas presented in Xam Idea Class 12 Physics book Chapter 2 Electric Potential and Capacitance uses some of the basic concepts of electric charges and fields taught in the first chapter. This chapter effectively teaches you how to derive values of charge on a capacitor, energy density of a capacitor, how to calculate equivalent capacitance, potential energy in an equipotential surface, calculations of capacitors involving dielectric constants.

**Electric potential**

The electric potential at a point in an electric field is essentially defined as the total amount of work done in bringing a unit charge to that point from infinity. At infinity, an electric potential is taken to be zero.

**Equipotential surface**

An equipotential surface is defined as a surface where electric potential at every point on it is equal or same.

**Electrostatics of conductor**

The electrostatic field inside a closed conductor is taken to be zero and that at the surface is equal to the normal at that point on the surface of the conductor.

**Capacitor**

A capacitor is a combination of two conductors separated by an insulator where the two conductor plates have equal and opposite charges on them and thus there is a potential difference between these two conductor plates. The two plates are joined to a source of energy such as a battery.

**Capacitance**

The capacitance of a conductor is given by the mathematical formula C = Q/V where C= capacitance, Q = charge stored in the capacitor plates and V= potential difference between the capacitor plates.

However, it also depends on the geometry of the capacitor such as shape, size and distance of separation between the two conductor plates. The capacitance of a conductor is defined as the measure of its ability to store electric charge in it. A capacitor with high capacitance will be capable of storing more electric charges than a capacitor of comparatively less charge.

**The energy density of a capacitor**

The energy density of a parallel plate capacitor is defined as the energy per unit volume that is stored between the plates of the parallel plate capacitor and is denoted by ‘u’.

**Dielectrics and its effects**

The insulators in which a microscopic local displacement of charges takes place in the presence of electric field are called dielectrics. Dielectrics act as non-conductors up to a certain value of the field called the dielectric strength after which they start conducting. There are mainly two types of dielectrics – polar (water, alcohol, hydrochloric acid gas, ammonia gas) and non-polar dielectrics (nitrogen, oxygen, benzene, methane).

**Dielectric Strength**

The maximum value of an electric field that a dielectric can withstand before breaking is called the dielectric strength of that particular dielectric.

**Capacitors in Series**

The equivalent capacitance of a number of capacitors arranged in series is given by:

1/Cs = 1/C (1) + 1/C (2) + 1/C (3)……

**Capacitors in Parallel**

The equivalent capacitance of a number of capacitors arranged in parallel is given by:

Cp = C(1) + C(2) + C(3)+ ……

### Discussion of Exercises of Xam Idea Solutions for Class 12 Physics Chapter 2: Electric Potential and Capacitance

**VSAQ (Very Short Answer Questions) **

- VSAQ portion has a total of 43 questions divided into two sections PYQ (previous year questions) and OIQ (objective inventory questionnaires) having 21 and 22 questions respectively each.
- These questions mostly cover the portions of work done, potential difference, equipotential surfaces, the potential at a point and some numerical related to such topics.
- This section is comparatively easy and can be easily solved if the concepts are clear.

**SAQ – I (Short Answer Questions – I)**

- SAQ – I portion has a total of 27 questions divided into two sections (PYQ and OIQ), each section having 15 and 12 questions respectively.
- These questions are mostly based on the portions of potential difference and finding the magnitude and direction of electric fields.
- Some questions are based upon equivalent capacitance, electrostatic shielding and charging and discharging of capacitor plates.

**SAQ – II (Short Answer Questions – II)**

- SAQ – II portion has a total of 22 questions in a single section. These questions cover topics of equipotential surface, potential energy and derivations of potential difference.
- You will also be solving questions related to dielectric constant, equivalent capacitance and energy stored in a capacitor.
- Some previous year CBSE questions are also included in this section and require the complex problem-solving ability to solve them.

**LAQ (Long Answer Questions) **

- LAQ portion consists of a total of 6 questions most of which are CBSE previous years questions.
- All the questions in this portion are derivations and numerical and require a clear concept on all the topics in the chapter.
- Mostly, the questions in this section are based on energy density, derivations of capacitance, potential energy and differences and dielectric constants.

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