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A viscous fluid is flowing through two horizontal pipes. The pressure difference \( P_{2}-P_{1} \) between the ends of each pipe is the same. The pipes have the same radius, although one is
\( \mathrm{P} \) twice as long as the other. How does the volume flow rate \( Q_{B} \) in the longer pipe compare with the rate \( Q_{A} \) in the shorter
W pipe?
(1) \( Q_{B} \) is the same as \( Q_{A} \).
(2) \( Q_{B} \) is twice as large as \( Q_{\wedge^{\text {. }}} \).
(3) \( Q_{B} \) is four times as large as \( Q_{A} \).
(4) \( Q_{B} \) is one-half as large as \( Q_{i} \).
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