Question

Using a 9-volt battery for more electrical energy.Using a 9-volt battery for more electrical energy.

B Longer wire allows for more turns around the iron core.Longer wire allows for more turns around the iron core.
C More turns of wire around the core and the maximum voltage.More turns of wire around the core and the maximum voltage.
D Using a double-nail core and more turns of wire around that core.

Answer 1

[AI-generated answer — Bot GPT 3.5]

D Using a double-nail core and more turns of wire around that core.