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when a cosntant potential difference is applied across the ends of a conducter, the temperature of the conductor increases after sometime, then what is the effect on drift velocity of electron? Discuss it. |
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Answer» SOLUTION :When a potential difference is applied across the ends of a conductor, an electric field is set up inside the conductor Due to it, the free electrons of the conductor get accelerated towards the positive end of the conductor and gain kinetic energy, which is transferred to the ATOMS IONS of the conductor through collisions, and frequency, showing the increase in vibrational energy of the ions/atoms of conductor. This accounts for the RISE in temperature of the conductor. Duet ot increase in vibrational energy of the ions/atoms of the conductor, the free electrons accelerated towards the positive end of the conductor suffer more frequent collisions with the ions/atoms of the conductor. As a result of it, the time of relaxation `(tau)` decreases. As `v_(d)=(eF)/(m)tau`, so drift velocity of electron decreases. |
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