WAEC Physics 2010 Theory — Question 9
Question 9 of 22 from the West African Examinations Council (WAEC) Physics 2010 Theory paper, with the correct answer and a full explanation.
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14(b) A proton moving with a speed of 5.0x10⁵ ms⁻¹ enters a magnetic field of flux density 0.2 T at an angle of 30° to the field. Calculate the magnitude of the magnetic force exerted on the proton. [Proton charge = 1.6x10⁻¹⁹ C]
Model answer
Velocity of proton = 5.0x10⁵ m/s; magnetic flux density, B=0.2T; angle to field, θ=30°. F=qvBsinθ = 1.6x10⁻¹⁹ x 5.0x10⁵ x 0.2 x sin30° = 8x10⁻¹⁵N.
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