Bert says that a charged particle in a vacuum can travel in a ...

[jessicacav]

Bert says that a charged particle in a vacuum can travel in a helix only if a uniform electric field and a uniform magnetic field are both present and both parallel to the axis of the helix. Stuart says that only a magnetic field with a component parallel to the axis of the helix is needed. Which one, if either, is correct, and why?
 a. Bert, because the charged particle's velocity can have a vertical component only if an electric field in the vertical direction is present.
  b. Stuart, because a component of velocity in the vertical direction is not changed by a vertical component of a magnetic field. c. Bert, because a component of velocity in the vertical direction is changed by a vertical component of a magnetic field. d. Stuart, because an electric field in the vertical direction would cause the particle to come to a complete stop.
  e. Neither, because particles cannot move in helical paths in the presence of magnetic and electric fields.

Question 2

A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67  10-27 kg) and a charge of 3.20  10-19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of
 a. 0.261 m.
  b. 0.522 m.
  c. 1.04 m.
  d. 3.27 m.
  e. 3.13  1026 m.

[mk6555]

Answer to Question 1

B

Answer to Question 2

B

[jessicacav]

Excellent

[milbourne11]

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