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JAMB Physics 2000 Question 32

Question 32

Magnetism

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

  1. A.E/B
  2. B.EB
  3. C.B/E
  4. D.E − B
Show the answer and explanation

Answer: A (E/B)

Explanation

The ion passes straight through when the electric and magnetic forces balance: qE = qvB, so v = E/B.