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JAMB Physics 1978 Question 34

Question 34

Electrostatics

Why is it impossible for the lines of force of an electric field to cross one another?

  1. A.like charges repel each other
  2. B.a charged particle is deflected by an electric field
  3. C.like charges are arranged on the same lines of force
  4. D.a positively charged particle can travel in only one direction at any time
  5. E.none of these is correct.
Show the answer and explanation

Answer: D (a positively charged particle can travel in only one direction at any time)

Explanation

A line of force shows the direction a positive charge would move. If two lines crossed, the charge at that point would have two directions at once, which is impossible.