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Homework Help: Hall Voltage question

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data

    What is the Hall voltage? B = 2.5 T, I = 15 A, q = 1.6*10^-19 C, n = 8.47*10^22 electrons/cm^3. B is going through a square slab 0.20 cm x 1.5 cm (B going through 0.20 cm thick part... not sure which one though counts as the width)


    2. Relevant equations
    V_H = v_d * B * w where w is width
    v_d = I/(nqA)
    V = (IBd) / (nqA)

    3. The attempt at a solution
    V = (15 A * 2.5 T * 0.015 m) / ((8.47*10^22 electrons/cm^3)*(1*10^6 cm^3 / m^3)*(1.6*10^-19 C)*(0.015 m * 0.0020 m) = 1.3*10^-6V

    It is multiple choice and the answers are 2.6 V, 1.9 mV, 3.6 micro V, 4.2 mV, or none of them. I am leaning towards none of the above but it usually is pretty rare for one of these questions so I suspect there's an error in my calculations...
  2. jcsd
  3. Nov 3, 2008 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    I get about same answer, 1.4 micro V
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