Question

4. (10 pts.) A piece of p-type semiconductor (in which the charge carriers have a positive charge) is subjected to a Hall effect experiment as shown below: Red Black . Red Determine which way the magnetic field is actually pointing of the two possible directions shown, up or down), given that /> 0 and the voltage measured by the voltmeter VA is positive (the voltmeter might not be corrected in the conventional polarity for Hall measurements). Clearly illustrate your reasoning process on the sketch for credit, showing any relevant formulas (guesses and unclear or incomplete reasoning will not be accepted). Further explanation may be given below:

Answer 1

A Given, it is a p-type semiconductor A is tue - more positive charges are present on side than on side ① . All the holes must deflect towards side . he know that ? = qx (W x B) - ④ Direction of is in the soc is towards the left side. - and For hand must ve holes accumulate towards Ê side this to happen, from Fleming right rule and , the magnetic field be down t ie, pointing towards ŷ direction for VA to be positive.