CAPACITOR UDIT GUPTA MNNIT ALLAHABAD EX VMC PHYSICS FACULTY arts
What is a capacitor? Combination of two conductors placed close to each other CAPACITOR . One of the conductors is given a positive charge and the other is given an equal negative charge. . The conductor with the positive charge is called the positive plate and the other with the negative charge is called negative plate. The charge on the positive plate charge on the capacitor The potential difference between the plates potential of the conductor.
Diagram Representation . One of the conductors has a positive +0 -0 charge +Q and the other has an equal negative charge -Q. Vt . The first one is at a potential V+ and the other one is at a potential V The charge on the capacitor is Q and the potential of the capacitor is V -V+ -V Single capacitor Group of capacitors NOTE: The charge on the capacitor does not mean the total charge on the capacitor. The total charge on the capacitor is +Q-Q = 0.
Capacitance For a given capacitor, the charge Q on the capacitor is proportional to the potential difference V between the plates. Thus, CV The proportionality constant C is called the capacitance of the capacitor. Capacitance depends upon: Shape of the conductors Size of the conductors Geometrical placing of the conductors Medium between the conductors
Units of capacitance The SI unit of capacitance is coulomb per volt, generally written as farad. The symbol F is used for it. This is a large unit on normal scales and microfarad ( 1F) is used more frequently The symbol of capacitor is shown below:
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