The dipole moment of a dipole has a direction from the negative charge to the positive charge. Show that the electric field at p along the y axis is E =(1/4×3.14×e knot)×(3qa^2/y^4),when y>>a. Candidates who are ambitious to qualify the Class 12 with good score can check this article for Notes. E ∝ x). The net electric flux through any closed surface depends only on the charge inside that surface. It is important to note that there is no analogous law of quantisation of mass. The materials which allow electric charge (or electricity) to flow freely through them are called. We know that in a nucleus proton and neutron exists while electron revolve around the nucleus. If the flux emerging out of a Gaussian surface is zero then it is not necessary that the intensity of electric field is zero. Electric Field Intensity The electric field intensity at any point due to source charge is defined as the force experienced per unit positive test charge placed at that point without disturbing the source charge. Electric field intensity due to a point charge q, at a distance (r, is the thickness of medium of dielectric constant K. Fix origin of the coordinate system where electric field intensity is to be found. Energy in unit volume of electric field is called energy density and is given by, Electric Field due to an isolated point charge, A circular ring of radius R with uniformly distributed charge, [The charge on ring behaves as point charge], A circular disc of radius R with uniformly distributed charge with surface charge density σ, An infinite sheet of uniformly distributed charges with surface charge density σ, A finite length of charge with linear charge density, Due to a spherical shell of uniformly distributed charges with surface charge density σ, Due to a solid non conducting sphere of uniformly distributed charges with charge density ρ, Due to a solid non-conducting cylinder with linear charge density λ. As symbol of proton is (p+) so proton carrying positive charge and symbol of electron is (e-) so electron carrying negative charge. Also, it varies directly with the separation between the charges of the dipole. value is given by. The force between two dipoles increases (or decreases) by K. -times as the distance between them decreases (or increases) by K-times. Class 12th-NEET Physics - Electric Charges and Fields | IMPORTANT QUESTIONS | NEET 2020 2021 | AIIMS - Duration: 2:53:33. (because it is a scalar product of the two). Recent studies on high energy physics have indicated the presence of graphs with charge 2e/3, e/3. Hence the deflection of the particle along y-axis after time t is ; This shows that the path of charged particle in perpendicular field is parabola. For uniform electric field when the angle between area vector, For uniform electric field when the angle between the area vector and electric field is not constant throughout the area, The electric flux is a scalar although it is a product of two vectors. SI unit of electric field is N/C (Force/Charge). Electric force, like the gravitational force acts between the bodies that are not in contact with each other. 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