helen adjusts the armature of an electric generator by increasing the number of coils around the iron core…

Brief Explanations:

In an electric - generator, the induced electromotive force (emf) and thus the current are related to the number of coils. According to Faraday's law of electromagnetic induction, the induced emf $\epsilon = -N\frac{\Delta\Phi}{\Delta t}$, where $N$ is the number of coils and $\Delta\Phi$ is the change in magnetic flux over time $\Delta t$. Increasing $N$ increases the induced emf, and assuming the resistance of the circuit remains constant, by Ohm's law $I=\frac{\epsilon}{R}$, an increase in emf leads to an increase in current.

Answer:

increase the amount of current