A Proton Travels at a Speed of 5 $\vec { B }$

question 108

Multiple Choice

A proton travels at a speed of 5.0 × 10⁷ m/s through a 1.0-T $\vec { B }$ field.What is the magnitude of the magnetic force exerted by the field on the proton if the angle between the proton's velocity and the $\vec { B }$ field vector is 30°? (e = 1.60 × 10^-19C)

• A)2.0 × 10^-14 N
• B)4.0 × 10^-14 N
• C)2.0 × 10^-12 N
• D)4.0 × 10^-12 N

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