A semiconducting crystal 12mm long, 5mm wide and 1mm thick has a magnetic flux density of 0.5Wb/m2 applied from front to back perpendicular to largest faces. When a current of 20mA flows length wise through the specimen, the voltage measured across its width is found to be 37 V. What is the Hall coefficient of this semiconductor?

A semiconducting crystal 12mm long, 5mm wide and 1mm thick has a magne

1.	A semiconducting crystal 12mm long, 5mm wide and 1mm thick has a magnetic flux density of 0.5Wb/m² applied from front to back perpendicular to largest faces. When a current of 20mA flows length wise through the specimen, the voltage measured across its width is found to be 37 V. What is the Hall coefficient of this semiconductor?
A.	37 10<sup>-6</sup> m<sup>3</sup>/C
B.	3.7 10<sup>-6</sup> m<sup>3</sup>/C
C.	3.7 10<sup>6</sup> m<sup>3</sup>/C
D.	0
Answer» C. 3.7 10<sup>6</sup> m<sup>3</sup>/C