Physics Group - II (3110018)

      Phy-3110018   Four-point probe and Van Der Pauw measurements for carrier density
BE | Semester1  Topic : Four-point probe and Van Der Pauw measurements for carrier density

Q4 (a) Winter-2019   Define Hall effect. Give its physical significance.

3 Marks
 Unit : Measurements

Q4 (b) Winter-2019   2.0 cm wide and 1.0 mm thick copper strip is placed in a magnetic field 1.5 Wb/m2 perpendicular to the strip. Suppose a current of 200 A is set up in the strip what will be the Hall potential appeared across the strip? (n = 8.4 x 1028 electrons/m3). 

4 Marks
 Unit : Measurements

Q4 (c) Winter-2019   Explain four probe method. Derive an equation to calculate resistivity of a thin sample.  

7 Marks
 Unit : Measurements