A student notes these readings for a conductor:
Voltage (V): 2, 4, 6
Current (A): 1.0, 2.0, 3.1
When the points are plotted on a V–I graph they do not lie on one straight line. What does this indicate about the conductor?
a) It is ohmic; the slight scatter is due only to experimental error
b) It is non-ohmic because its resistance increases as the current increases
c) It is non-ohmic because its resistance decreases as the current increases
d) No definite conclusion about the resistance can be drawn from the plotted points