Electrostatic force Electrostatic force has following properties 1. Force on any charged particle situated in its electrostatic electric field is given by [Called electrostatic Lorentz force 2. This force is independent of direction or amount of their velocity. 3. It acts in the direction of field on a positive charge & acts opposite to […]
Electrostatic field If the electric field of a charge at a point doesn’t vary with the time, then the electric field is called electrostatic electric field. It’s effect on other charges is studied by defining two quantities; one a scalar field function called electric field potential ‘V’ & second a vector field function called electric […]
Charge is source of field An electric charge at rest produces only electric field around it. An electric charge moving with uniform velocity produces both electric and magnetic fields around it but radiates no energy. An accelerated charge produces both electric and magnetic fields around it as well as radiates energy in the form of […]
Dielectric constant Dielectric constant is also called relative permittivity or specific inductive capacity & is defined as K = 1 (air or vacuum), K = 81 (water), K = ∞ (metals), K = 0 (insulator) Dielectric constant decreases on heating.
Coulomb’s Law Force of interaction (attraction or repulsion) between two static point charges is called electrostatic forces. For two static point charges electrostatic forces is described by Coulomb’s law is called electrostatic constant. The quantity eo is called permitivity of free space (vacuum /air). Its value is eo = 8.98755 x 10 –12 N– 1 […]
*Properties of charge 1. Charge is scalar, i.e. has no direction. 2. Charge is additive i.e. total charge on a body is given by addition of individual charges for discrete distribution & by integration for continuous distribution. 3. Charge is conserved in any isolated process 4. Charge is quantized i.e. charge smaller than electronic charge, […]
*Graph of exponential functions Functions y = ax, a < 1 & y = a– x, a > 1 are exponentially decreasing. Functions y = ax, a > 1 & y = a– x, a<1 are exponentially increasing. The y intercept of the function y = ax is point (0, 1). If a = e […]
*Graph of logarithmic function The function y = logb x is called a logarithmic function, it is not defined for x ≤ 0. It is a decreasing function for 0 < b & increasing for b > 1. The y – axis is an asymptote of the curve y = logb x. The x intercept […]
*Ellipse An ellipse is a closed curve like a circle. An ellipse may be drawn by choosing two points F1 and F2, each of which is a called a focus, and then drawing a curve through points for which the sum of the distances PF1 and PF2, respectively, is a constant. If the center of […]
*Circle The locus of a point P (x, y) which moves in a plane so that its distance from a fixed point is always a constant. The fixed point is called the centre C (u, v) of the circle and the constant distance is called its radius (R). Also a radius of a circle is […]
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