An alpha particle (a He nucleus, containing two protons and two neutrons and
having a mass of 6.64 x 10<sup>-27</sup> kg) traveling horizontally at 35.6 km/s enters a
uniform, vertical, 1.80 T magnetic field.
Part A
What is the diameter of the path followed
Express your answer with the appropriate units.
d = 0.821 mm
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Correct answer is shown. Your answer
Part B
What effect does the magnetic field have on the
The speed increases with time.
The speed remains constant.
The speed decreases with time.
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Part C
What is the magritude of the acceleration of the alpha particle while it is in the magnetic field?
Express your answer with the appropriate units.
a = 3.00Ă—10<sup>12</sup>
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Correct answer is shown. Your answer 3.088Ă—10<sup>12</sup> m/s<sup>2</sup> was either rounded differently or used a different number of significant figures than
Part D
What is the direction of this acceleration?
The acceleration is perpendicular to v and B and so is horizontal, out of the center of curvature of the particle's path.
The acceleration is perpendicular to v and parallel to B and so is horizontal, along the particle's path.
The acceleration is perpendicular to v and B and so is horizontal, toward the center of curvature of the particle's path.
The acceleration is parallel to v and perpendicular to B and so is vertical, along the particle's path.
Part E
Explain why the speed of the particle does not change even though an unbalanced external force acts on it.
The unbalanced force F<sub>B</sub> is parallel to v so it changes the magnitude of v but not its direction, which is the speed.
The unbalanced force F<sub>B</sub> is parallel to v so it changes the direction of v but not its magnitude, which is the speed.
The unbalanced force F<sub>B</sub> is perpendicular to v so it changes the direction of v but not its magnitude, which is the speed.
The unbalanced force F<sub>B</sub> is perpendicular to v so it changes the magnitude of v but not its direction, which is the speed.
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