Water is conveyed through a uniform tube of 8 cm in diameter and 3140 m in length at the rate $2 \times 10^{-3} m^3$ per second. The pressure required in maintain the flow is : <br> (Viscosity of water = $10^{-3}$ SI units )

Question

( A ) $0.00625\; Nm^{-2}$
( B ) $0.0625\; Nm^{-2}$
( C ) $6.25 \times 10^3\; Nm^{-2}$
( D ) $0.625\; Nm^{-2}$