Final answer:
To produce a current of 200 amperes through a resistance of 1 x 10^-3 ohms, a voltage of 0.2 volts is necessary, as determined by Ohm's law (V = IR).
Step-by-step explanation:
To find the voltage necessary to produce a current of 200 amperes through a resistance of 1 x 10-3 ohms, we can use Ohm's law, which is expressed as V = IR. V represents the voltage, I is the current in amperes, and R is the resistance in ohms. In this case:
V = (200 amperes) x (1 x 10-3 ohms)
V = 0.2 volts
Therefore, a voltage of 0.2 volts is needed to produce a current of 200 amperes through a resistance of 1 x 10-3 ohms.