Electric Field due to a Point Charge The electric field strength describes how strong or weak an electric field is at that point A point charge produces a radial field A charge sphere also acts lik...
Electric Force between Two Charges All charged particles produce an electric field around them This field exerts a force on any other charged particle within range The electrostatic force be...
Electric Field Strength The electric field strength at a point is defined as: The force per unit charge acting on a positive test charge at that point The electric field strength can be calculated ...
Defining an Electric Field An electric field is defined as a region of space in which a charged particle experiences a force Hence, electric fields are a type of force field The charged particle co...
Centripetal Force Centripetal force can be calculated using any of the following equations: Centripetal force is always perpendicular to the direction of travel Where: F = centripetal force...
Maintaining Circular Motion An object moving in a circle is not in equilibrium, it is constantly changing direction Therefore, in order to produce circular motion, an object requires a resultant fo...
Deriving Equations for Centripetal Acceleration An object moving in uniform circular motion travels with a constant angular velocity and angular speed However, its direction is always changing Ther...
Angular Velocity The angular velocity ω of a body in circular motion is defined as: The rate of change of angular displacement In other words, angular velocity is the angle swept out by an object i...
学习A Level的同学都知道大部分英国院校发放的本科offer是基于三门A Level成绩，而每一门A Level的最高等级就是A*，在每年的Alevel考试中，取得三个A*的成绩都是很多同学的目标。那么A Level考试取得三个A*有多难...
