Answer:
c.)The Hall probe that we will use in this lab is made of a semiconductor.
d.)The Hall Effect gives rise to a voltage difference across a conductor, perpendicular to the direction of the current flow in the region of magnetic field.
Step-by-step explanation:
Hall effect :
When a magnetic field applied on the semiconductor in which current is flowing perpendicular to the applied magnetic field then it produce voltage difference perpendicular to the current as well as magnetic field.Magnetic filed and voltage are proportional to each other.By the using of hall effect this is used to measure speed ,position and magnetic field.
So the option (C) and (D) is correct.