Duduli

Derivation:-

Answer:- It is the charge distribution or a charged body whose electrostatic effect at a point away from it is to be analysed.For application of Coulomb's law the source charge has to be a point charge.

Answer:- One coulomb of charge is defined as that charge which when placed, in air, at a distance of 1 metre from an equal and similar charge repels it with a force of 9×10⁹ newton.

Answer:- Charge does not possess any direction.So, it is a scalar quantity.No doubt charge is capable of travelling in a particular direction depending upon the potential gradient, but no characteristic direction can be assigned to charge itself.

It is defined as the product of the charge strength (q) and the distance (2l) separating the two charges. I.e →The dipole moment is a vector,     directed from the negative to positive     Charge.

Reason :- Charge resides only on the surface of conductor so the total charge of hallow shell(shell means closed surface) lies on their surface.Therefore charge inside the hallow shell is zero. According to Gauss's theorem    Integration of E•dA=q(inside)/epsilon Here total charge inside the hallow shell is zero So integration of E•dA=0/epsilon=0         That implies E=0 It is the answer to the question why electric field inside the hallow shell is zero.

Reason:- Tangent at any point on the line of force gives the direction of electric intensity at that point. I.e let two electric lines of force intersect each other then their is possibility of two direction of electric lines of force at that point which is not possible because every point have a unique direction of electric field.that is why electric lines of force do not intersect each other. Look at the figure which give you more clarity about my words Are you satisfied by this answer

Answer:- An electric dipole is a pair of equal and opposite charges -q & +q separated by a distance 2a. The line containing two charges defines a direction in space. I.e The direction of dipole moment always from negative charge to positive charge. The total charge on electric dipole is always zero.But electric field due to dipole is not zero  because distance between -q & +q is small so net electric field at a point not exactly cancelled out.

Answer:- Dielectric constant is a property of medium. Dielectric constant of a medium is defined as the ratio of permitivity of that medium to the permitivity of free space. Dielectric constant is also known as relative permitivity of the medium .this defination is only valid in C.G.S system. It is denoted by. K   I.e As it is the ratio of two like quantities it is unitless and dimensionless. More is the dielectric constant of the medium lesser is the Electrostatic force in that medium. It depends only on the medium on which charges are placed. Are you satisfied by this answer

Answer:-  Conservation of charge means charge can neither be created nor be destroyed in any condition. Charges may get redistributed in a surface but total charge of the isolated system is always conserved.like conservation of energy, conservation of charge is also a universal law. e.g A neutron turns into a proton & an electron but have equal and opposite charges and the total charge is zero before and after the creation. i.e  Are you satisfied by this answer

Answer: Principle of superposition states that:- If a system contain n charges placed near to each other and behave independent to  each other then net electrostatic force in any rest  charge is the vector sum of all the forces produced by all remaining charges on that rest charge. I.e

In geometry we define a point as a body of zero radius.since zero radius is not possible,a body having negligible dimensions is termed as a point.such a body having  a charge upon it is known as a point charge. Are you satisfied  by this answer

Expression:-