I'm currently studying Cambridge A-Levels Based on the definition of electric field strength in the textbook, in which electric field strength at a point is the force per unit charge exerted on a charge at the point, the equation E = F/Q can be derived. Parallel plates are an example where the electric field strength is uniform o We need a different equation to deal with this uniform electric field strength because so far our equations deal with a changing electric field strength To help us understand the equations used for a uniform electric field, you first The new silicon sensor does not measure the direction of the electric field, but its strength. It can be used for fields of a relatively low frequency of up to one kilohertz. He came up with the following equation for field strength in a radial field: where. g = field strength at a point G = the universal gravitational constant, value 6.7 x 10-11 Nkg-2m2 m = the mass of the object which causes the field r = the separation between that point and the centre if the object causing the field.