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Electric field due to two charges on line joining them

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A charge Q2=4.0 nC is placed at a distance of r=10 m away from another charge Q1=18 nC as shown below.
Find the electric field at the point P which is at a distance of r1=6.0 m from Q1. Note: Report your answer correct to two significant figures.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
NC towards