Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electric Dipole: A pair of equal and opposite charges separated by a small distance is called an electric dipole. The midpoint of -q and +q is called the centre of the dipole. Dipole Moment of an Electric Dipole: The strength of an electric dipole is measured by […]
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electric Field Lines: An electric field line in general is a curve drawn in such a way that the tangent to it at each point is in the direction of the electric field at that point. Properties of Electric Field Lines: 1. Electric field lines start from positive
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electric Field Due to System of Charges: Let we consider n point charges q₁, q₂, q₃,…… qₙ with position vector r₁, r₂, r₃……rₙ exert forces F₁, F₂, F₃,…..Fₙ on test charge q₀ placed at origin O. If E is electric field at point P due to
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electric Field Due to a Point Charge: Let a point charge q is placed at the origin O. We wish to determine it’s electric field at a point P, such that op=r. Now if we placed a test charge q₀ at point P, then according to coulomb’s
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electric Field: The electric field due to a charge q at a point in space may be defined as the force that a unit positive charge would experience if place at that point. Electric Field Intensity: The electric field intensity at any point due to source
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Electrostatic Force Due to Continuous Charge Distribution: The reason in which charges are closely spaced is said to be have continuous charge distribution of charge. Continuous charge distribution is of three types. 1. Linear Charge Distribution: If a charge distribution is distributed along one dimensional curve
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Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Forces Between Multiple of Charges:(Superposition Principle):- It state that when a number of charges are interacting, the total force on a given charge is the vector sum of the forces exerted on it due to all other charges. The force between two charges is not affected by
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Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Absolute Permittivity of Medium: (Dielectric Constant):- The force between two charges q₁ and q₂ located at a distance r apart in a medium may be written as-
Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Comparison of Coulomb’s law with Gravitational law: Both the Coulomb’s and Newton’s Law follow Inverse Square Law. Electric force can be attractive or repulsive, But gravitational force is always attractive in nature.
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Chapter-1|Electric Charges and Fields | NCERT 12th Physics: Coulomb’s Law in Vector Form: We consider two positive charges q₁ and q₂ are placed in vacuum at a distance r from each other. They repel to each other. According to Coulomb’s law the magnitude of force on charge q₁ due to q₂ is given by
