WAEC Physics 2016 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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43. A 10μC charge moves with a velocity of 1.0×10⁵ ms⁻¹ at right angle to a uniform magnetic field of flux density 5.0×10⁻⁴T. Calculate the force on the charge. A. 5.0×10⁻⁵ N B. 5.0×10⁻⁴ N C. 5.0×10⁵ N D. 5.0×10⁶ N
- A. 5.0×10⁻⁵ N
- B. 5.0×10⁻⁴ NCorrect
- C. 5.0×10⁵ N
- D. 5.0×10⁶ N
Explanation
F=qvBsinθ, θ=90°: F=10×10⁻⁶×1×10⁵×5×10⁻⁴×sin90° = 5×10⁻⁴N.
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