Under which condition is the proportional relationship between potential difference…
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
Under which condition is the proportional relationship between potential difference and current (Ohm’s law) strictly valid for a metallic conductor?
(a) The potential difference applied across the conductor is kept extremely small
(b) The conductor is steadily heated so that its temperature rises
(c) The temperature of the conductor remains constant
(d) The cross-sectional area of the conductor is gradually increased