l. (25pts.) Consider the circuit shown in the gure. 4.0.11 1*3")? 3-0J1r 5 mt (a) Find the current through the 12 V battery as a function of the emf 5. (b) For which values of S is the current through the 12 V battery going from its negative to its positive end and for which values is it owing in the opposite direction? Explain briey to support your calculation. (c) Find the current through and voltage across every resistor if 8 = 35 V. (d) Now. the 3.0 Q resistor is replaced by and unknown resistor R. For which values of R. is the current through the 12 V battery going from from its negative to its positive end and for which values is it owing in the opposite direction