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JAMB Physics 2007 Question 23

Question 23

Electrostatics

A charge 50 μC has an electric field strength of 360 NC−1 at a certain point. The electric field strength due to another charge 120 μC kept at the same distance apart and in the same medium is

  1. A.18 NC−1
  2. B.144 NC−1
  3. C.150 NC−1
  4. D.864 NC−1
Show the answer and explanation

Answer: D (864 NC−1)

Explanation

At the same distance, E = kq/r2 is proportional to q. E = 360 × 120/50 = 864 N C−1.