• University of Toronto

• PHYA 21

PHYA21 - Physics II (Physical Sciences)

Practical Session #08

Week #09: Wednesday, Mar.11 - Friday, Mar.13

Reading Material: Chapter 28 (28.1 - 28.8); Chapter 29 (29.1 - 29.5)

1. After passing through a velocity selector (not shown), anti-protons (negatively charged protons), are deflected using a magnetic field as indicated in the figure.

(a) Electric and magnetic fields in the velocity selector have

magnitudes of 50 kV/m and 0.25 T, respectively. Find the

kinetic energy of the selected anti-protons. Give your

answer in eV.

(b) The magnetic field region is 5.0 cm wide. Find the magnitude of the magnetic field necessary to cause a deflection of 30◦.

2. An electron moves to the right in a region where both electric and magnetic fields are present. The electric

field is directed up while the magnetic field is directed into the page, as indicated in the figure. The electron

moves with an initial speed of 1000 m/s, the magnetic field has a magnitude of 3.0 T, and the electric field

has a magnitude of 5.0 kV/m.

(a) What are the magnitude and direction of the initial acceleration of the electron