A7. an ideal liquid of density 1 gm/cc is flowing at a rate of 10 gm/s through a tube with varying cross-section, as shown in the figure. b a two pressure gauge

A7. An ideal liquid of density 1 gm/cc is flowing at a rate of 10 gm/s through a tube with varying cross-section, as shown in the figure. B A Two pressure gauges attached at the points A and B (see figure) show readings of PA and PB respectively. If the radius of the tube at the points A and B is 0.2 cm and 1.0 cm respectively, then the difference in pressure (PB Pa), in units of dyne cm , is closest to (a) 140 (b) 160 (c) 100 (d) 120