physical difference between metals and nonmetals

(higher potential to lower potential). Note that the free electrons flow in the direction opposite to the conventional current. For electrons to be driven through a resistance, there has to be a potential difference across its ends. Work is done by the electrical force due to this potenti..

There is a potential difference between the sphere and the metal holding the charge inside so that the alter has a positive potential relative to the sphere. (b) When the metal touches the sphere, the induced negative charge and the metal holding the char..

>A metal contains a large number of free electrons. They move at random within the metal with different velocities. But at ordinary temperatures, they cannot leave the surface due to attractive forces between the electrons and the positive ions. If the metal ..

The Photoelectric Effect - There are three ways in which electrons eject out of a material. They are (i) Thermionic emission (ii) Field emission (iii) Photo electric emission In all the above cases, energy is given to the material but in different forms. If given in the form of heat it is..

It consists of two dees or D-shaped metal chambers D 1 and D 2 . The dees are separated by a small distance. The two dees are perpendicular to their plane. P is the position where the ion source is placed. The dees are maintained to a potential difference whose polarity altern..

Energy exists in various forms such as mechanical energy, heat energy, chemical energy, electrical energy, light energy and nuclear energy. According to the law of conservation of energy, energy can be transformed from one form to another. In our daily life we use many devices where the electrical ..

Heating Effect of Electric Current - Energy exists in various forms such as mechanical energy, heat energy, chemical energy, electrical energy, light energy and nuclear energy. According to the law of conservation of energy, energy can be transformed from one form to another. In our daily life we u..

. If the surfaces that are in contact are rough, there is more friction. Hence to reduce friction, the surfaces in contact are kept smooth and polished. It is worth noting that if the two surfaces in contact are of the same metal, the friction increases on polishing the two surfaces. This..

Introduction - In the chapter on current electricity, we had learnt about the flow of charges, conditions to produce the flow and how different materials respond to an external electric field. We had seen how materials are classified as conductors and insulators. In this chapter, we will ..