Q 2 [20 points] : Resistor (R = 4 9) connected to a battery (with EMF of a: 5 V and internal resistance r=1 Q ) as shown in the gure. R1: 40 a) What is the total current in the circuit? (the internal resistance F19)? b) What is the terminal voltage (Vab) between the two terminals of the battery? c) After using the battery, the internal resistance (r) increased to 100 Q. Calculate the terminal voltage now