Ex

  Physics (NTSE/Olympiad)  

1. Electricity

Flow Of Current In A Metal

Flow Of Current In A Metal
Metals show a very different kind of bonding called metallic bonding. According to this bonding, the outermost electrons are not bound to any particular atom, and move freely inside the metal randomly as shown in fig. So, these electrons are free electrons. These free electrons move freely in all the directions. Different electrons move in different directions and with different speeds. So there is no net movement of the electrons in any particular direction. As a result, there is no net flow of current in any particular direction.

Fig. Flow of electrons inside a metal wire when no potential is applied across its ends

Fig. Flow of electrons inside a metal wire when the two ends of a wire are connected to the two terminals of a battery

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