Electric field The space around a charged particle in which another charge experience a force is known as electric field. Electric field due to a circular loop of charge This is a linear charge distribution in which the charge is distributed along the circumference of the ring or circular loop. If observation point lies on the centre of the loop, then the electric field internsity at this point i.e., at the centre of the loop will be zero. If observation point lies very far from the centre of the loop then the value of electric field will be same as the electric field due to a point charge. It means in this case the circular loop behaves as a point charge for the observation point. Electric field due to an infinitely long straight uniformly charged wire In this article the charge is distibuted along the length of the wire. The electric field at any point due to infinitely long straight wire varies inversely with distance from the wire. NOTE The present lecture is a biling...

Electric field The space around a charged particle in which another charge experience a force is known as electric field. Electric field due to a circular loop of charge This is a linear charge distribution in which the charge is distributed along the circumference of the ring or circular loop. If observation point lies on the centre of the loop, then the electric field internsity at this point i.e., at the centre of the loop will be zero. If observation point lies very far from the centre of the loop then the value of electric field will be same as the electric field due to a point charge. It means in this case the circular loop behaves as a point charge for the observation point. Electric field due to an infinitely long straight uniformly charged wire In this article the charge is distibuted along the length of the wire. The electric field at any point due to infinitely long straight wire varies inversely with distance from the wire. NOTE The present lecture is a biling...

Electric field The space around a charged particle in which another charge experience a force is known as electric field. Electric field due to a circular loop of charge This is a linear charge distribution in which the charge is distributed along the circumference of the ring or circular loop. If observation point lies on the centre of the loop, then the electric field internsity at this point i.e., at the centre of the loop will be zero. If observation point lies very far from the centre of the loop then the value of electric field will be same as the electric field due to a point charge. It means in this case the circular loop behaves as a point charge for the observation point. Electric field due to an infinitely long straight uniformly charged wire In this article the charge is distibuted along the length of the wire. The electric field at any point due to infinitely long straight wire varies inversely with distance from the wire. NOTE The present lecture is a biling...

Electric field due to circular loop of charge Electric field The space around a charged particle in which another charge experience a force is known as electric field. The source of electric field is either a charge or a time varying magnetic field. If the value of electric field does not change with time, then it will be uniform electric field, otherwise it will be non-uniform electric field. Electric field due to circular loop of charge If λ is linear charge density, then the charge on d l dq = λ d l      ⇒     dq = (q / 2πa) d l Electric field at P due to charge dq Special cases When P lies at the centre of the loop i. e., r = 0, then E = 0 When P lies very far from the centre of the loop i. e., r >> a, then E = kq / r 2 In this case circular loop behaves as a point charge. To know more about this topic please click on the link  https://youtu.be/54MIe0Ow43w   or...

Electric field Electric field The space around a charged particle in which another charge experience a force. Here red circles shows the electric field. In this figure q is source charge and q 0 is test charge. The source of electric field is either a charge or a time varying magnetic field. If electric field ( E ) does not change with time, then it is said to be uniform electric field, otherwise it is non-uniform electric field. Electric field intensity The electrostatic force per unit test charge is electric field intensity.                     Since test charge q 0 should be infinitesimally small.          Unit of electric field Unit of electric field is N / C or V / m Since force on q 0 due to q                     Therefore electric field    ...

Coulomb’s law According to Coulomb's law the force between two charges is directly proportional to the product of two charges. is inversely proportional to the square of the distance between the charges. F ∝ q 1  q 2 F ∝ 1 / r 2 By using above two equation we get, F ∝ q 1  q 2  / r 2 F = k q 1 q 2 / r 2 Here k is a constant and its value depends on the medium in which charge is placed and the system of unit used. For vacuum k = 1/4πε 0 = 9 х 10 9 Nm 2  / C 2 . ε 0 is permittivity of free space and its value is 8.854 х 10 -12  C 2  / Nm 2 . In vacuum       F vac  = q 1  q 2  / 4πε 0  r 2 In medium      F med  =  q 1  q 2  / 4πε r 2 ∴           F vac / F med = ε / ε 0 = ε r = K Here ε r is relative permittivity or dielectric constant. Important points Coulomb’...

Charge and its properties What is charge No body knows, what is charge, only we know the properties of charge and what charge can do? Type of charge There are two types of charge, positive and negative. Positive charge due to proton and negative charge due to electrons. There is no third charge in universe. Quanisation of charge Charge is always found to be in packets, not continuous. Charge given to a body is always an integral multiple of a smallest unit of charge and this smallest unit of charge is equal to the charge of electron ( e = 1.6*10 -19 C). q = ne,                  here n = 0, 1, 2, ... Conservation of charge The charge can neither be created, nor be destroyed, it can only be transferred from one part of the system to another part. The total charge of an isolated system is always constant. Σq i = constant,           here q i = c...