The Hall effect is to be used to find the sign of charge carries in a semiconductor sample. The probe is placed between Own poles of a magnet so that magnetic field Is pointed up. A current is passed through a rectangular sample placed horizizontally. As current is passed through the sample in the east direction, the north side of the sample is found to be at a higher potential than the south side. Decide if the number density of charge carriers is positively or negatively charged.
The Hall effect is to be used to find the sign of charge carries in a semiconductor sample. The probe is placed between Own poles of a magnet so that magnetic field Is pointed up. A current is passed through a rectangular sample placed horizizontally. As current is passed through the sample in the east direction, the north side of the sample is found to be at a higher potential than the south side. Decide if the number density of charge carriers is positively or negatively charged.
The Hall effect is to be used to find the sign of charge carries in a semiconductor sample. The probe is placed between Own poles of a magnet so that magnetic field Is pointed up. A current is passed through a rectangular sample placed horizizontally. As current is passed through the sample in the east direction, the north side of the sample is found to be at a higher potential than the south side. Decide if the number density of charge carriers is positively or negatively charged.
Question:
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Figure 1. A rectangular sample of semiconductor is in a magnetic field B, oriented approximately into the page, as shown. The sample is connected to
an ammeter, voltmeter and a voltage source.
The schematic shows a circuit involving a sample of semiconductor, whose cross-section is L by w. The sketch is not to scale and the electrodes
attached to the sample are not shown. A uniform magnetic field B is applied in the direction indicated by the crosses (roughly, into the page). Each
charge carrier has a charge q and the density of charge carriers, measured in ions per cubic metre, is n.
Part 1)
Use the definition of electric current to give an expression for the average speed of the charge carriers when the ammeter registers a current i.
vd =
Part 2)
Give an expression for the magnitude of the magnetic force on a charge carrier. Your answer should be in terms of ¿, not v.
F=
Part 3)
The magnetic force in part 2 produces a lateral displacement in the charge carriers, and the…
A biophysics experiment uses a very sensitive magnetic field probe to determine the current associated with a nerve impulse traveling along an axon. If the peak field strength 1.0 mm from an axon is 8.0 pT, what is the peak current carried by the axon?
33. Parts (a) through (e) of this problem should be done by
inspection-that is, mentally. The intent is to obtain an
approximate solution without a lengthy series of calcula-
tions. For the network in Fig. 102:
a. What is the approximate value of I1, considering the
magnitude of the parallel elements?
b. What is the ratio I¡/I2? Based on the result of part (a),
what is an approximate value of 12?
c. What is the ratio I/I3? Based on the result, what is an
approximate value of I3?
d. What is the ratio I/I4? Based on the result, what is an
approximate value of I4?
e. What is the effect of the parallel 100 kN resistor on the
above calculations? How much smaller will the current
I4 be than the current I¡?
f. Calculate the current through the 1 2 resistor using the
current divider rule. How does it compare to the result
of part (a)?
g. Calculate the current through the 10 2 resistor. How
does it compare to the result of part (b)?
h. Calculate the current through the 1 kn resistor. How
does…
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