22.6 The Hall Effect We have seen effects of a magnetic field on free-moving charges. The magnetic field also affects charges moving in a conductor. One result is the Hall effect, which has important implications and applications. Figure 22.27 shows what happens to charges moving through a conductor in a magnetic field. The field is perpendicular to the electron drift velocity and to the width of the conductor. Note that conventional current is to the right in both parts of the figure. In part (a), electrons carry the current and move to the left. In part (b), positive charges carry the current and move to the right. Moving electrons feel a magnetic force toward one side of the conductor, leaving a net positive charge on the other side. This separation of charge creates a voltage e, known as the Hall emf, across the conductor. The creation of a voltage across a current-carrying conductor by a magnetic field is known as the Hall effect, after Edwin Hall, the American physicist who discovered it in 1879. OB (out of paper) RHR-1 [F. (a) F. в (b) F, Ba out Figure 22.27 The Hall effect. (a) Electrons move to the left in this flat conductor (conventional current to the right). The magnetic field is directly out of the page, represented by circled dots; it exerts a force on the moving charges, causing a voltage e, the Hall emf, across the conductor. (b) Positive charges moving to the right (conventional current also to the right) are moved to the side, producing a Hall emf of the opposite sign, -ɛ. Thus, if the direction of the field and current are known, the sign of the charge carriers can be determined from the Hall effect.
22.6 The Hall Effect We have seen effects of a magnetic field on free-moving charges. The magnetic field also affects charges moving in a conductor. One result is the Hall effect, which has important implications and applications. Figure 22.27 shows what happens to charges moving through a conductor in a magnetic field. The field is perpendicular to the electron drift velocity and to the width of the conductor. Note that conventional current is to the right in both parts of the figure. In part (a), electrons carry the current and move to the left. In part (b), positive charges carry the current and move to the right. Moving electrons feel a magnetic force toward one side of the conductor, leaving a net positive charge on the other side. This separation of charge creates a voltage e, known as the Hall emf, across the conductor. The creation of a voltage across a current-carrying conductor by a magnetic field is known as the Hall effect, after Edwin Hall, the American physicist who discovered it in 1879. OB (out of paper) RHR-1 [F. (a) F. в (b) F, Ba out Figure 22.27 The Hall effect. (a) Electrons move to the left in this flat conductor (conventional current to the right). The magnetic field is directly out of the page, represented by circled dots; it exerts a force on the moving charges, causing a voltage e, the Hall emf, across the conductor. (b) Positive charges moving to the right (conventional current also to the right) are moved to the side, producing a Hall emf of the opposite sign, -ɛ. Thus, if the direction of the field and current are known, the sign of the charge carriers can be determined from the Hall effect.
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The Hall Effect
• Describe the Hall effect.
• Calculate the Hall emf across a current-carrying conductor.
Transcribed Image Text:22.6 The Hall Effect
We have seen effects of a magnetic field on free-moving charges. The magnetic field also affects charges moving in a conductor.
One result is the Hall effect, which has important implications and applications.
Figure 22.27 shows what happens to charges moving through a conductor in a magnetic field. The field is perpendicular to the
electron drift velocity and to the width of the conductor. Note that conventional current is to the right in both parts of the figure. In
part (a), electrons carry the current and move to the left. In part (b), positive charges carry the current and move to the right.
Moving electrons feel a magnetic force toward one side of the conductor, leaving a net positive charge on the other side. This
separation of charge creates a voltage e, known as the Hall emf, across the conductor. The creation of a voltage across a
current-carrying conductor by a magnetic field is known as the Hall effect, after Edwin Hall, the American physicist who
discovered it in 1879.
OB (out of paper)
RHR-1
[F.
(a)
F.
в
(b)
F,
Ba
out
Figure 22.27 The Hall effect. (a) Electrons move to the left in this flat conductor (conventional current to the right). The magnetic field is directly out of
the page, represented by circled dots; it exerts a force on the moving charges, causing a voltage e, the Hall emf, across the conductor. (b) Positive
charges moving to the right (conventional current also to the right) are moved to the side, producing a Hall emf of the opposite sign, -ɛ. Thus, if the
direction of the field and current are known, the sign of the charge carriers can be determined from the Hall effect.
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