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Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Question as written in textbook: "Figure 1 illustrates a nested arrangement of four cylindrical conductors seen side-on in cross-section in which the cylinders are separated by electrical insulators.
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insulators and conductors
Solved > Question Can an insulator be charged? If so, | ScholarOn
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Now-a-days all the electronic devices which we use are based on the controlled flow of electrons. Before , mostly the electronic devices were made of vacuum tubes also called valves like the diode valve which has two electrodes; anode often called plate and cathode, triode valve which has three electrodes i. In these vacuum tubes, the electrons are provided by heating the cathode using low tension battery and controlled flow of electrons is achieved by varying the voltage between its different electrodes. A vacuum is created between interelectrodes so that the moving electrons may not lose their energy on collision with air molecules can flow only in one direction i.
Some materials permit electric charge to move easily from one region of the material to another, while others do not. For example, Fig. Suppose you touch one end of the wire to a charged plastic rod and attach the other end to a metal ball that is initially uncharged; you then remove the charged rod. When you bring another charged body up close to the ball Figs.