Conceptual Questions:
1. Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the electron?
a. out of the page
b. to the right
c. to the left
d. into the page
2. Electrical charges and magnetic poles have many similarities, but one difference is:
a. opposite magnetic poles repel.
b. one magnetic pole cannot create magnetic poles in other materials.
c. a magnetic pole cannot be isolated.
d. magnetic poles do not produce magnetic fields.
Numerical Problems: answers link to a help page.
1. An electron which moves with a speed of 3 x104 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (qe = 1.6 x10-19 C)
2. A proton moving with a speed of 3 x105 m/s perpendicular to a uniform magnetic field of 0.20 T will follow which of the paths described below (qp = 1.6 x10-19 C and mp = 1.67 x10-27 kg)?
ans: a circular path of 1.5 cm radius
3. Two singly ionized isotopes, X and Y, of the same element move with the same speed perpendicular to a uniform magnetic field. Isotope X follows a path of radius 3.35 cm while isotope Y follows a path of rdius 3.43 cm. What is the ratio of the two isotope masses, mX/mY?