In a hall experiment a conducting strip of thickness d = 100 μm is placed in a magnetic field b = 0.05 T. The magnetic field is perpendicular to the direction of the strip along which there is a 10-A current. What is the hall voltage measured across the strip if the charge carrier density is 2.5 × 10²⁸/m³ in this material?
A. 4.2 μv
B. 2.5 μv
C. 0.72 μv
D. 6.2 μv
E. 1.3 μv