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Drift velocity

by Larsson
Tags: drift, velocity
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Larsson
#1
Mar5-07, 06:32 PM
P: 28
Not sure if this should be in this forum, but lets try.

The problem is about 2 samples. One pure Na and one InSb.
I want to determine the hall voltage when we send a current of 100mA trough the samples and the magnetic field is B = 0.1T. The samples are dimensioned "squared" 5x1x5mm. We send our current into the 5x1 side and out at the opposit side.

I start with stating F = 0 = q(E +v x B)
Here I have everything except for the E that I want to find, and v, the driftvelocity of the electrons. How am I supposed to find my v with the information given? Would appriciate if you could show the calulations eventough it's not populair here, having my test soon.

this is part b of an assignment. In the a part they give m_e* = 0.015m_0 and m_h* = 0.18m_0. Where * means the efficient mass. Dont really think thats needed in the b part, but just to be sure.
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Larsson
#2
Mar5-07, 06:42 PM
P: 28
Never mind
J = N_e *(-e) * v_d
J = I/A
I/A = N_e *(-e) * v_d
v_d = I/(A*N_e*(-e))


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