Download SP 212 Worksheet Lesson 19: Ch. 28.2-28.3, The Hall Effect electrons/m

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SP 212 Worksheet
Lesson 19: Ch. 28.2-28.3, The Hall Effect
1) A strip of copper (n = 8.47 × 1028 electrons/m3 ) is 150 µm thick and 4.5 mm wide. It is placed in a
uniform B-field of magnitude 0.65 T that is perpendicular to the strip. A current i = 23 A is sent through
the strip. What voltage V develops across the width of the strip?
2) An electron is accelerated from rest through a potential difference V1 = 1.2 kV. It then enters a region
between two parallel plates separated by d = 25 mm, with a potential difference V2 = 170 V; the lower plate
is at the lower electric potential. Due to the presence of a uniform magnetic field, the electron travels with
constant velocity between the plates. Answer the questions below.
a) What is the electron’s kinetic energy after being accelerated across the potential difference V1 ? What,
then, is its speed upon entering the region between the plates?
b) In the region between the plates, what is the direction of the electrostatic force acting on the electron?
What is the direction of the magnetic force acting on the electron?
c) In unit vector notation, what is the magnetic field in the region between the plates?
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