The heat produced in a conductor is proportional to the square of the current (H ∝ I²). If the current is tripled, the heat increases by 3² = 9 times. Thus, the temperature rise will be 4°C × 9 = ...
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Resistance of a bulb is R = V²/P . For 25 W: R₁ = 220²/25 = 1936Ω and for 100 W: R₂ = 220²/100 = 484Ω. Total resistance Rtotal = 1936 + 484 = 2420Ω. Current I = 440/2420 ...
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 ...
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 ...