Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source?
A) 20 V
B) 40 V
C) 60 V
D) 80 V
E) 100 V
E
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