A pipe contains an oil of specific gravity 0.9. A differential manometer connected at the two points A and B shows a difference in mercury leve as 15 cm. The difference of pressure at the two points A and B will be (Note: consider the density of mercury as 13600 kg/m³) O 18688 N/m2 O 15981 N/m2 O 288 N/m2 O 6528 N/m²
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