Final answer:
The magnitude of the electric field between the plates is calculated using the formula E = V/d, which gives 1000 V/m as the correct answer. The options provided do not include this value, indicating a potential error in the question.
Step-by-step explanation:
The question is asking for the magnitude of the electric field between two opposite charge plates that are connected to a 100V battery and are 10 cm apart. The electric field (E) can be calculated by the formula E = V/d, where V is the voltage and d is the distance between the plates. Substituting the given values, we get E = 100 V / 0.10 m = 1000 V/m. The options provided in the question do not include the correct answer; however, if the intended options had a typographical error and '1000 V/m' was meant to be an option, that would be the correct magnitude of the electric field.