Two wires X and Y give the following readings:
Wire X
Voltage (V): 1.5, 3.0, 4.5
Current (A): 0.30, 0.60, 0.90
Wire Y
Voltage (V): 1.5, 3.0, 4.5
Current (A): 0.20, 0.40, 0.60
Straight-line V–I graphs are obtained for both wires. What is the ratio of their resistances RY:RX?
a) 2:3
b) 3:2
c) 1:1
d) 2:1