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We know that electric current flows through a conductor only when some electric field is applied across it. This electric field applied constant force on electrons. But the motion of electrons is not accelerated . Why ? |
| Answer» Solution :Free electrons donot get a free straight path HO acceleates. So when electric field is applied to ametallic conductor then electrons move and then very soon collide with the metal ions LOSS energy. Due to several OBSTRUCTIONS in the path of electrons, electric field is not able to accelerate them continuosly . Rather electrons develop one CONSTANT average VELOCITY known as drift velocity. The moment applied potential difference is zero, electric current instantly becomes zero. a resistor continuously requires energy to maintain current through it. | |