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What is the EMF? Give your answer in Volts to at least three significant digits. R1 = 12.7 Ohms, R2 = 23.5 Ohms, lo = 0.25 Amps, Ic = 0.51 Amps W w When the switch is open the current from the battery is lo and when the switch is closed the current from the battery is Ic. A battery with EMF = Vp and internal resistance r is attached to the circuit shown with resistors R and R2, and a switch. TR