A student obtained the following set of readings for a conductor: V (V): 0.5 , 1.0 ,…
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A student obtained the following set of readings for a conductor:
V (V): 0.5 , 1.0 , 1.5 , 2.0 , 2.5
I (A): 0.10 , 0.20 , 0.31 , 0.40 , 0.50
Which conclusion best describes the behaviour of the conductor on the basis of these data?
(a) The conductor does not obey Ohm’s law because its resistance doubles with voltage.
(b) The conductor follows Ohm’s law only up to about 1V; after that the rising current shows that its resistance drops due to heating, so it is non-ohmic.
(c) The conductor obeys Ohm’s law; the slight deviation at 1.5V is due to experimental error.
(d) The resistance decreases sharply, so the conductor is non-ohmic.