please help answer question 1 and 2

Question 1 By using Kirchhoff's Laws, find the current through cach resistor in the circuit above. 2.0 22 1.022 6.0 V 3.0 V 4.0 22 1.0 22 6.0 V 2.0Ω (6 marks) Question 2 (a) A strip of copper, 2.0 mm thick and 1.50 cm wide, is placed in a uniform magnetic field, B of 0.40 T3 shown in Figure below. + When a current, 7 of 75 A is conducted in the *x-direction, the maximum Hall Voltage, Vs obtained is 0.81 4V. From this measurement, determine the electron charge density, w in this copper. *electron charge density amount of electron in 1.0 mº (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)