Скачать или смотреть Why Relaxation Time τ Depends on Temperature but Not on E Field | NCERT Exemplar

The relaxation time τ is nearly independent of applied E field
whereas it changes significantly with temperature T. First fact is
(in part) responsible for Ohm’s law whereas the second fact leads
to variation of ρ with temperature. Elaborate why


⚡ NCERT Exemplar Current Electricity Q.3.13 Explained

In this video, we discuss a very important concept:
👉 Why is the relaxation time (τ) nearly independent of the applied electric field E but changes significantly with temperature T?

📌 Concepts Covered:

Meaning of relaxation time (τ) = average time between two successive collisions of electrons.

Why applied electric field doesn’t affect τ → electrons gain velocity but collisions are controlled by lattice properties.

How increasing temperature increases lattice vibrations, reduces mobility, and decreases τ.

Link between τ and Ohm’s Law.

Why variation of τ with temperature explains the change in resistivity (ρ) with T.

🔥 This is a classic NCERT Exemplar problem for NEET | JEE | Class 12 Boards — tested again and again in conceptual questions.

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