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In the following figure(Figure 1) switch S1 is closed while switch S2 is kept open. The inductance is L = 0.210 H , the resistance is R = 70.0 Ω , and the emf of the battery is 29.0 V . At time t after S1 is closed, the current in the circuit is increasing at a rate of di / dt = 7.20 A/s.At this instant what is Vab, the voltage across the resistor? Express your answer to three significant figures and include the appropriate units.