Chapter-3|Current Electricity| NCERT 12th Physics: Electric Current in Conductors: The electrical conductivity of a solid substance depends upon the number of free electron in it. In metals, this number is quite large (nearly 10²⁹/m³). Hence metal are good conductors of electricity. In metals, the electric conduction occurs by the movement of negative charge Carriers (electrons) […]
Chapter-3|Current Electricity| NCERT 12th Physics: Current Density: The current density at any point inside a conductor is defined as the amount of charge flowing per second through a unit area held normal to the direction of the flow of charge at that point. It is a vector quantity having the same direction as that of
Chapter-3|Current Electricity| NCERT 12th Physics: Electric Current: If two bodies charged to different potentials are connected together by means of conducting wire, charges begin to flow from one body to another. The charges continue to flow till the potential of the two bodies become equal. The flow of electric charges through a conductor constitutes an
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Energy Stored in a Capacitor: The energy of a charged capacitor is measured by the total work done in charging the capacitor to a given potential. The work done in charging the capacitor is stored as its electrical potential energy. Let we consider a capacitor of capacitance C.
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Combination of Capacitors: When there is a combination of capacitors in a circuit, we can sometime replace that combination with an equivalent capacitor. The two basic combinations of capacitors which can be replaced by single equivalent capacitor, are Capacitors in Series: When negative plate of one capacitor is
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Effect of Dielectric on Parallel Plate Capacitor: Let a dielectric is inserted between the plates fully occupying the intervening reason. The dielectric is polarized by the electric field due to two metallic positive and negative plates. Since, the direction of Eᵢ (Induced electric field) and E₀ (External electric
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Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Parallel Plate Capacitor: The simplest and the most widely used capacitor is the parallel plate capacitor. It consists of two large plane parallel conducting plates, separated by a small distance. Electric field due to infinite plane sheet X away from positive charge If q is the
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Capacitors and Capacitance: A capacitor is an arrangement of two conductors separated by an insulating medium that is used to store electric charge and electric energy. Capacitance of Capacitor: A capacitor consists of two conductor having charges +Q and -Q. The potential difference between them is V=V₁
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Dielectrics and Polarisation: In a dielectric under the effect of an external field, a net dipole moment is induced in the dielectric due to molecular dipole moment, a net charge appears on the surface of the dielectric. These induced charges produce a field opposing the external field.
Chapter-2|Electrostatic Potential and Capacitance| NCERT 12th Physics: Electrostatics of Conductors: Conductors: Conductors are the materials through which electric charges can flow easily. When a conductor is placed in electrostatic field, the conductors show the following properties. 1. Inside a conductor, electrostatic field is zero. 2. At the surface of a charged conductor, electrostatic field must
