In a horizontally held injection syringe, the piston of $0.2 c m^{2}$ cross-sectional area is pushed at a constant speed of 1.0 cm/s to eject water into the atmosphere through a hypodermic needle of $0.7 m m^{2}$ cross sectional area while rinsing. Neglecting losses, the force required to move the piston is nearly

- 1
  
  6 kg
- 2
  
  $6 \times 10^{- 3} k g$
- 3
  
  $6 \times 10^{- 5} k g$
- 4
  
  $6 \times 10^{- 7} k g$

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