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  Read the following information: (a) Resistivity of copper is lower than that of aluminium which, in turn, is lower than that of constantan. (b) Six wires labelled as A, B, C, D, E, F have been designed as per the following parameters:

Wire	Length	Diameter	Material	Resistance
A			Aluminium	R1
B			Constantan	R2
C			Constantan	r3
D			Copper	R4
E			Aluminium	r5
F			Copper	R6

Answer the following questions using the above data: (a)Which of the wires has maximum resistance and why? (b)Which of the wires has minimum resistance and why? (c)Arrange R1, R2 and R5 in ascending order of their values. Justify your answer.  

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