# How to use *Electrostatic units* in a sentence

He supposes the field near the earth to be ioo volts per metre, or 1/300

**electrostatic units**.For simplicity, he assumes I + and I_ each equal 0.25 X106

**electrostatic units**.If the two small conducting spheres are placed with centres at a distance d centimetres, and immersed in an insulator of dielectric constant K, and carry charges of Q and Q'

**electrostatic units**respectively, measured as above described, then the mechanical force between them is equal to QQ'/Kd 2 dynes.If a small conducting body is charged with Q

**electrostatic units**of electricity, and placed in any electric field at a point where the electric force has a value E, it will be subject to a mechanical force equal to QE dynes, tending to move it in the direction of the resultant electric force.In the same manner, if an electrified body carries a positive charge Q

**electrostatic units**and is placed in an electric field at a place where the electric force or electromotive intensity has a value E units, it is urged in the direction of the electric force with a mechanical force equal to QE dynes.AdvertisementReturning to the case of the charged body with the space around it cut up into electric cells by the tubes of force and shells of potential, it is obvious that the number of these cells is represented by the product QV, where Q is the charge and V the potential of the body in

**electrostatic units**.The quantity of electricity which must be given to the sphere to raise it to unit potential is therefore R

**electrostatic units**.The above method is especially useful for the determinations of very small capacities of the order of Ioo

**electrostatic units**or so and upwards.The charge on the earth itself has its surface density given by v = - (I/47r) X125 volts per metre, =0.000331 in

**electrostatic units**.From this we deduce for the charge p per cubic centimetre (I/41r)Xio-5 (volt/cm 2), or 2.7 X 101

**electrostatic units**.AdvertisementThus the capacity of a sphere in

**electrostatic units**(E.S.U.) is the same as the number denoting its radius in centimetres.The jar has a certain capacity C which is best expressed in microfarads or

**electrostatic units**(see Electrostatics), and is determined by the surface of the tin foil and thickness and quality of the glass.