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Capacitor And Capacitance Class 12 Physics Notes

#9. Capacitor And Capacitance  What is a Capacitor? The capacitor is the device that is used to store electrical energy. It consisted of two electrical conductors separated by a distance. The space between the conductors may be filled with an insulating material known as dielectric. The ability of capacitor to store charge is known as capacitance . This is the symbolic representation of the capacitor Working Of The Capacitor Before explaining the working of a capacitor, let's consider this basic circuit diagram of parallel plate capacitor. There are two conductors plates separated by a small distance 'd'. The space between the conductors is filled with dielectric.  The working of the capacitor can be divided into two parts (1) charging of the capacitor (2) discharging of the capacitor Charging of the capacitor When we connect the DC supply to the capacitor, one plate is connected to the positive plate and the other plate is connected to the negative plate. When the potentia...
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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 ...
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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 Questi...
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