Physics Class 12 Chapter 2 Electrostatic Potential And Capacitance

#1. Electrostatic Potential & Capacitance - Introduction

Electrostatic Potential Energy

The electrostatic potential energy at any point in an electric field is define as the amount of work done in moving a unit positive charge from infinity to that point point against electrostatic force without acceleration.

Electrostatic Potential

The electrostatic potential at any point in an electric field is equal to the amount of work done per unit positive test charge or in bringing the unit positive charge from infinity to that point, against the electrostatic force without acceleration.

Unit is Volt (V) and V = 1 J/C

It’s a scalar quantity

Electrostatic Potential Difference

The electrostatic potential difference between two points in an electric field is define as the amount of work done in moving a unit positive charge from one point to other point against electrostatic force without acceleration.

Where W_AB is the work done in taking charge q from point A to B against electrostatic force

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Class 12 Physics Chapter 1 Electric Charges and Fields Notes

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Energy Stored In A Capacitor Class 12 Physics Electrostatic Potential And Capacitance

Energy Stored In A Capacitor We have already studied that capacitors store electrostatic energy in it. Today we will learn how they store energy? and how much energy can be store in a capacitor? As always to find the energy we have to find the work done. So, consider a small positive charge +dQ, work has to be done to transfer this small +dQ to move towards this positive plate(because it's against the electric field). This work is stored as potential energy. Work done W = charge X potential i.e, W =qV Here charge is dQ so we can write dW = dQ V = dQ Q/C ( from equation Q = CV ) integrating on both sides we get This equation consisted to be general equation. By substituting values of Q and C we get other 2 forms of energy stored in capacitor applying Q = CV in equation (1) applying C = Q/V in equation (1) Prev Next You may be Interested In Physics Previous Question Papers With Answers Browse more topics under Electrostatic Potential & Capacitance

Equipotential Surface Class 12 Physics Electrostatic Potential Surfaces And Capacitance

#4. Equipotential Surface Equipotential is the surface which has equal potential at every point on it. Equipotential surface due to a single point charge are concentric spheres having the charge at the center. All the points on a sphere around a point charge have the same distance (radius) so all have same potential. Equipotential surface for a line charge is cylinder Properties of Equipotential Surface Work done for moving a charge on an equipotential surface is zero The potential difference between any two points on equipotential surface is zero Electric Field is always perpendicular to an equipotential surface Equipotential surface for a single point charge are concentric spheres having the charge at the center Two equipotential surfaces can never intersect. Browse more topics under Electrostatic Potential & Capacitance Electrostatic Potential, Potential Energy, Potential Energy Difference Potential Due To A Point Charge Potential Due To An Electric Dipole Equipotential Surfa

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