Question 2 (a) A strip of copper, 2.0mm thick and 1.50 cm wide, is placed in a uniform magnetic field, B of 0.40 Ta shown in Figure below. B VH 1 B When a current, 7 of 75 A is conducted in the +x-direction, the maximum Hall Voltage, Vas obtained is 0.81 V. From this measurement, determine the electron charge density, w in this copper. *electron charge density amount of electron in 1.0m'. (2 marks) (b) Give an example of a type of material (conductor / semiconductor / insulator) can be analysed using Hall Effect (Hall Voltage). What is the information we can gain from it? (2 marks)