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JAMB Physics 1987 Question 45

Question 45

Magnetism

When two parallel wires carry currents in opposite directions, the force on either wire is

  1. A.away from the other wire
  2. B.zero, because the currents cancel each other
  3. C.twice as much as when the currents are in the same direction
  4. D.towards the other wire.
Show the answer and explanation

Answer: A (away from the other wire)

Explanation

Parallel currents in opposite directions repel, so each wire is pushed away from the other.