In the lab, you are trying to find the inductance and internal resistance of a solenoid you place it in series with a battery of negligible internal resistance, a 10 Ω resistor and a switch. You then put an oscilloscope across one of these circuit elements to measure the voltage across that circuit element as a function of time. You close the switch and the oscilloscope shows voltage versus time as shown in the following figure.
(i) What is the emf of the battery–
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