Consider a positive charge +q due to which the intensity of the electric field at a point P is to be calculated. To find the intensity of electric field at point P, consider the positive test charge qₒ situated at that point. Therefore, Electric force on positive test charge qₒ F = [1/4π€₀].[q.q₀/r²] Newton Electric … Read more
Intensity of electric field near a charged plane sheet of infinite extension Suppose that on one surface of a uniformly charged flat sheet of infinite extension whose surface density is δ. Near a positively charged flat sheet of infinite extension, there is a point P at a distance r from the sheet at which the … Read more
Intensity of the electric field due to uniformly distributed charge on a wire of infinite length. Or, Intensity of the electric field near a uniformly charged straight wire of infinite length. Suppose a charge is uniformly distributed on a line of length l. If linear density of the distributed charge is λ, Then the linear … Read more
Distance And Displacement 1. Distance Suppose an object is along the x-axis. In time t₁ the object reaches A from the original point and in time t₂ the object reaches B from the original point. AB=(x₂-x₁)=∆x Duration, ∆t=(t₂-t₁) Therefore, the length between two points in a given period of … Read more
1. Axial or Longitudinal Position Suppose an electric dipole with dipole moment P. We want to calculate the electric field intensity at a point P located at a distance r from the centre o of the dipole. Electric field intensity at point P due to +q charge E₁ = [1/4π€0].q/(r+l)²] Similarly, Electric field intensity at … Read more
Electric force line Electric force lines are imaginary but the electric fields generated by them are real. A tangent drawn at any point to the electric field line represents intensity of the electric field at that point. Properties of electric line of force 1. These lines run from positive charge and end at negative charge. … Read more
Importance of Coulomb’s law When a charge is stationary then only the electric force acts on it. Which was discovered by Coulomb. Therefore it is also called Coulomb force.When a charge is stationary then only the electric force acts on it. Which was discovered by Coulomb. Therefore it is also called Coulomb force. Coulomb’s law … Read more
Electric charge Electricity is the factor by which charge is generated in any object or substance. When a substance becomes electrostatic, the substance acquires charge. Therefore such a substance is called a charged substance. There are two types of electric charges. Those substances which accept charge have an excess of charge and those substances which … Read more
Photocell The photocell (light cell) is a craft technological application of the photoelectric effect. The photocell is a device that converts light energy into electrical energy. It is sometimes called the electric eye. A photocell consists of a semi-cylindrical light-sensitive metal plate C (emitter) and a wire loop (loop) A (collector) mounted in a vacuum … Read more
Error Analysis, Percentage Error *Numerical questions* 1. The width of a road of 20 meters is measured with the help of a 1 meter long rod. What is the maximum percentage error that can occur from this measurement? Solution- x=20 m ∆x=1 m percent error, =(∆x/x)×100 =(1/20)×100 =5% 2. The length of a … Read more
