1) A proton moves at a speed of 1.00E4m/s. A uniform magnetic field of strength B=0.001T is turned on with a direction that is 30 degrees to the velocity. The resulting motion is a helix. The radius of the helix is determined by considering only the portion of the velocity that is perpendicular to the magnetic field. The radius of the helix is:

• a)
• b)
• c)
• d)
• e)

Correct Answer: No answer given yet a b c d e

2) In question 1 above, what is the component of velocity of the proton that is parallel to the magnetic field?

• a)
• b)
• c)
• d)
• e)

Correct Answer: No answer given yet a b c d e

3) A wire lies on the y axis carrying a current of 5.00A in the positive direction. A second wire lies along the x axis and carries a current of 10.0A in the positive x direction. What is the magnetic field at the point (x=1.00m, y=1.00m)? Draw this so that you are looking down onto the xy plane.

• a)
• b)
• c)
• d)
• e)

Correct Answer: No answer given yet a b c d e