Aresistor has a current of 2 amperes when connected to a single battery. if a second identical battery is connected in series with the first, what is the current through the resistor? a) still 2 amps b) 4 amps c)1 amp d) no current

Ohm's law: Current = (voltage) / (resistance)

In the first situation:  2 A = V / R

After the change:  

Current = (2 · V) / R

Current = 2 · (V/R)

But each (V/R) = 2 A

So the new current is 4 A .  (choice-b)

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the answer for apex is the lowest