A battery is connected to two crocodile clips and a lamp. There is a gap between the crocodile
clips. Four cylinders W, X, Y and Z are made of the same metal but have different dimensions.
The cylinders are connected in turn, by their ends, between the crocodile clips. The diagrams
of the cylinders are all drawn to the same scale.
The cylinder that makes the lamp glow most brightly and the cylinder that makes the lamp
glow least brightly, respectively are:
○ W,Y
○ W,Z
○ X,Y
○ X,Z
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