The energy gained by an electron in an electric field E over a mean free path l is given by: eEl = 2 eV Solving for E: E = 2 × 1.6 × 10⁻¹⁹ /4 × 10⁻⁸ = 8 × 10⁷ ...
Category: Class 12 Physics
NCERT Solutions for Class 12 Physics updated for CBSE academic session 2021-2022.
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The temperature dependence of resistivity ρ(T) is influenced by: (a) Number of charge carriers can change with temperature T → In semiconductors and insulators, the number of free charge carriers increases with temperature, significantly affecting resistivity. (b) Time interval between ...
Kirchhoff’s junction rule states that the total current entering a junction equals the total current leaving it, reflecting charge conservation. Since charge cannot accumulate at a junction, the correct answer is (B) conservation of charge and (D) no accumulation of ...
To find the charge, integrate the given current function with respect to time from t = 0 to t = 2. The integral of current over time gives total charge. After solving, the charge is found to be 22 C, ...
Using the drift velocity formula vd = I/nAe’ where n = 8 × 10²⁸ electrons/m³, A = 5 × 10⁸ m², and e = 1.6 × 10⁻¹⁹ C, we get t = 6.4 × 10³ s Answer: (c). Class ...