Charge:- Charge on any body is a multiple integer of the charge of an electron or a proton.
Q = n.e
A comb gets charged when we rub it with our hairs, and when it is brought near to small paper pieces they gets attracted to it.
Polarity: A body can be negatively charged or it can be positively charged. When it is negatively charged, means it is overloaded with the free electrons, and it is positively charged when it becomes electron deficient. So polarity is either positive or negative.
Coulomb's Law: According to Coulomb's law there is a force of attraction between two dissimilar charges and there is a force of repulsion between two similar charges. This force is
(a) Directly proportional to the product of the charges
(b) Inversely proportional to the square of the distance between these charges.
(c) Inversely proportional to the permittivity of the medium.
F = K. q1.q2./r^2 K = 1/ 4(pi. ephsylum)
(Note - You have to put the vector sign on the F and put the unit vector on the right because it is a vector quantity)
Electric Potential Energy :- Electric potential energy is the energy stored in a charge which is either brought either from infinite distance to a distance r to another charge, or from distance 0 to a distance r.
U = K. q1.q2. / r
Electric Field Intensity: Electric field intensity at any point at a distance r from a given charge q is defined as the force experienced by a charge of unit Coulombs.
Dipole: When two equal and opposite charges are spaced at a distance of 2a, then dipole is product of the charge and the distance between these two charges.
p = q.2a
Dipole Moment: When an electric dipole is placed in an electric field it results into a torque.
T = q.E. 2a.sin(@) @ = angle which the dipole makes with the horizontal.
Gauss's Theorem: - Electric flux in a closed body containing some charge remains constant.
Q = n.e
A comb gets charged when we rub it with our hairs, and when it is brought near to small paper pieces they gets attracted to it.
Polarity: A body can be negatively charged or it can be positively charged. When it is negatively charged, means it is overloaded with the free electrons, and it is positively charged when it becomes electron deficient. So polarity is either positive or negative.
Coulomb's Law: According to Coulomb's law there is a force of attraction between two dissimilar charges and there is a force of repulsion between two similar charges. This force is
(a) Directly proportional to the product of the charges
(b) Inversely proportional to the square of the distance between these charges.
(c) Inversely proportional to the permittivity of the medium.
F = K. q1.q2./r^2 K = 1/ 4(pi. ephsylum)
(Note - You have to put the vector sign on the F and put the unit vector on the right because it is a vector quantity)
Electric Potential Energy :- Electric potential energy is the energy stored in a charge which is either brought either from infinite distance to a distance r to another charge, or from distance 0 to a distance r.
U = K. q1.q2. / r
Electric Field Intensity: Electric field intensity at any point at a distance r from a given charge q is defined as the force experienced by a charge of unit Coulombs.
Dipole: When two equal and opposite charges are spaced at a distance of 2a, then dipole is product of the charge and the distance between these two charges.
p = q.2a
Dipole Moment: When an electric dipole is placed in an electric field it results into a torque.
T = q.E. 2a.sin(@) @ = angle which the dipole makes with the horizontal.
Gauss's Theorem: - Electric flux in a closed body containing some charge remains constant.
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