4 Motion of a charged particle in the magnetic field

(G) Group work.

Ø  I Round – Multiple choice Question                                                                              [2]

Ø  II Round – Test Yourself                                                                                                [2]

Ø  III Round – Problem solving                                                                                          [3]

Multiple choice question (2 score)

1. A charged particle is situated in a region of space and it experiences a force only when it is in motion. Which of the following states the field or fields enclosed in the region correctly?

A) An electric field only

B) Both a magnetic field and an electric field

C) Both an electric field and a gravitational field

D) Both a magnetic field and a gravitational field

E) A magnetic field only

Test yourself (2 score)

2.      Refer to the following information for the next two questions.

If the orange diamond particle shown above is negatively charged, in which direction is the magnetic force acting on it while it is at the position shown?

A)      Towards the right side of the page (+x)

B)      Towards the left side of the page (-x)

C)      Towards the top of the page (+y)

D)      Towards the bottom of the page (-y)

E)        None of the above

True or False? As the magnetic force acts on the particles shown in the diagram above, it does work on each one. This would be evidenced by a change in the kinetic energy of each particle.

3. What is the direction of the magnetic field that produces the magnetic force on a positive charge as shown in each of the three cases in the figure below, assuming  is perpendicular to ?

Solving problem (3 score)

4. A cosmic ray proton moving toward the Earth at  5.0 ∙ 10⁷ m/s experiences a magnetic force of  1.70 ∙ 10^-16 N. What is the strength of the magnetic field if there is a 45⁰  angle between it and the proton’s velocity?