A eletroscopia é o estudo dos fenómenos eletrostáticos através de aparelhos mais comuns são o pêndulo elétrico e o eletroscópio de folhas. Comparaç˜ao entre o Eletroscópio de Folhas de Ouro e o. Eletroscópio Feito com Materiais de Baixo Custo O Eletroscópio e a Descoberta . Relatorio 14 Principio do Funcionamento do Eletroscopio de folhas Distribuicao de cargas em um condutor 1more. by Natalia Silva de Souza · Download .docx).

Author: Zulugore Dokinos
Country: Barbados
Language: English (Spanish)
Genre: Art
Published (Last): 12 July 2014
Pages: 51
PDF File Size: 16.22 Mb
ePub File Size: 16.56 Mb
ISBN: 685-1-82149-974-4
Downloads: 89114
Price: Free* [*Free Regsitration Required]
Uploader: Nilar

Eletroscopia by Bruna Fernandes on Prezi

In the introduction courses to electrostatics, many exercises involve charged spheres. In these cases to evaluate the total charge, the voltage, or the force, etc, it is important to take these image charges into account.

Method of image charge Figure 3 illustrates the method of image charge for a point charge close to a grounded sphere [3,4]. Electrostatics of two suspended spheres. The point charge q 1 epetroscopio virtual; the real charge induced is actually distributed at the surface of the sphere.

If the electroscope is made of hanging spheres instead of foils, then it is possible to obtain an analytical solution. Usually the problem is simplified by regarding the spheres as point charges.

Replacing q 0 for the expression in Eq. We also discuss the similarity with the sphere-plane electrostatic problem. The force between a point charge with index i in one sphere and a point charge with index elegroscopio in the other sphere is given by Coulomb’s law. Figure 3 illustrates the method of image charge for a point charge close to a grounded sphere [3,4]. Any difference between these two solutions will be discussed.


Figure 7 shows V for several values of d in a. Het was de Oostenrijkse natuurkundige Victor Franz Hess die de resultaten van Wulf verder testte door met een heteluchtballon nog hoger te gaan. Since the separation of the charged spheres is of the order of their radius the spheres cannot be described as point charges. Applying this method is easier than solving Laplace’s equation directly [2].

In calculating the electric potential one must define its value at some point in the space in the physical system. Smythe, “Static and Dynamic Electricity”, 2nd ed.

However, the accumulation of enough charge to detect with an electroscope requires hundreds or thousands of volts, so electroscopes are only used with high-voltage sources such as static electricity and electrostatic machines.

The sphere-sphere problem is very similar to the sphere-plane problem that we described in detail in Ref. The equilibrium among the electrical force, the weight P and the tension in the wire correlates V and d according to. When the electroscope is neutral Fig.

Pêndulo Eletrostático by Larissa Riffel on Prezi

This approach can be used as an analytical fophas for practical problems in the field of electrodynamics and its complexity is compatible with undergraduate courses. The greater is dthe faster is the convergence [6]. Een verklaring hiervoor kon hij niet geven. Solution for the electric force A simplification of the electroscope is depicted in Fig.


A simplification of the electroscope is depicted in Fig. The electroscope is an instrument presented to students in their introduction to electrostatics as a demonstration of the existence of electric charges Fig. Eletrosopio solution for the electric potential can be determined as if an image charge q 1 was at position x 1.

Lista de Exercícios (Terceiro Ano)

Si tratta quindi di un rivelatore di carica. Solving the system above we have. A type of electroscope is also used in the quartz fiber radiation dosimeter. Historically, this instrument was also important in the development of electricity [1].

Our calculation also indicates that an electroscope with two metal spheres needs rather high voltages to get deflection; however, those high voltages needed are easily obtained by rubbing objects. We shall use the method eleyroscopio images to correlate the applied voltage to the deflection of the spheres. Although the working principle of a traditional electroscope with thin metal deflection foils is simple, one needs numerical methods to calculate its foil’s deflection.

Consider the sphere with radius a centered at x 0 and the point charge, q 0placed at -x 0. This figure was made using the expressions eletroscoopio the electric field presented in the appendix.