Properties of Conductor💥Dielectrics💥Part 3/4 Chapter 2 Potential & Capacitance💥CBSE Class 12 Physics
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Class 12 Physics
NCERT Chapter 2 Potential & Capacitance
NCERT Chapter 2 Electrostatic Potential & Capacitance
Properties of Conductors in an external electric field
Dielectrics
polarisation of dielectrics
Dielectric Constant
susceptibility of dielectrics
Polar dielectrics
non-polar dielectrics
the electric field inside the conductor is zero
polarisation
polarisation density
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Chap 2 Part 3 Electrostatic Potential Capacitance
00:00:00 introduction
00:02:37 Conductors, Insulators
00:04:26 Free and Bound Charges
00:10:10 Behaviour of Conductors in Electrostatic Fields
00:32:13 Electrostatic Shielding
00:36:05 Applications of Electrostatic Shielding
00:37:55 Dielectrics and their Polarization
00:44:00 Polar and Non-Polar Dielectrics
00:49:50 Polarization
00:57:32 Reduction of Electric Field by the Polarization of a Dielectric
01:02:45 Reduced Field inside a Dielectric and Dielectric Constant
01:04:35 Polarisation density.
01:09:43 Electric Susceptibility
01:12:42 Relation between 𝜿 and 𝝌
01:18:35 Dielectric Strength
In Class 12 Physics, the properties of conductors and dielectrics are often discussed in the context of electrostatics and capacitance. Here are some key properties of conductors and dielectrics:
Properties of Conductors:
1. Electric Conductivity: Conductors have high electrical conductivity, which means they allow electric charges to move through them easily. This property is due to the presence of free electrons that can move in response to an electric field.
2. Low Resistance: Conductors have low resistance to the flow of electric current. This property is directly related to their high electrical conductivity.
3. Electrostatic Equilibrium: In electrostatic equilibrium, the excess charge on a conductor resides on its outer surface. This happens because charges repel each other and redistribute themselves to minimize their mutual repulsion. The electric field inside a conductor is zero.
4. Faraday Cage Effect: Conductors can shield the interior region from external electric fields. When an external electric field is applied to a conductor, the charges redistribute in such a way that the electric field inside the conductor cancels out the external field.
5. Uniform Potential: When a conductor is in electrostatic equilibrium, the electric potential is constant throughout its entire volume. Any excess charge resides on the surface, and the electric field inside the conductor is zero.
Properties of Dielectrics:
1. Insulating Nature: Dielectrics are materials that do not conduct electricity easily. They have high resistance to the flow of electric current due to the absence of free charge carriers.
2. Polarization: When a dielectric is placed in an electric field, the electric dipoles within the dielectric align themselves with the field. This phenomenon is called polarization. The alignment of dipoles creates an induced dipole moment in the dielectric, which opposes the external electric field.
3. Dielectric Strength: The dielectric strength of a material is the maximum electric field strength that it can withstand without breaking down and becoming a conductor. It is a measure of the material's ability to withstand high voltage without electrical breakdown.
4. Capacitance: Dielectrics are commonly used in capacitors to increase their capacitance. When a dielectric is inserted between the plates of a capacitor, it reduces the electric field between the plates, thereby increasing the amount of charge that can be stored on the capacitor for a given potential difference.
5. Permittivity: Dielectrics have a property called permittivity, which determines how much the electric field is reduced in the presence of the dielectric material. Permittivity is a measure of how easily a material can be polarized by an electric field.