WAEC Physics 2025 Objective — Question 7
Question 7 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
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For a charged body moving in an electric and magnetic crossed field, the ratio of the electric field intensity, E to the magnetic flux density, B is known as
- A. Lorentz ratio
- B. Charge ratio
- C. Velocity selectorCorrect
- D. Electrochemical equivalence
Explanation
In crossed E and B fields, only a charged particle with velocity v = E/B passes through undeflected — this ratio defines the velocity selector.
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