A battery is connected at its positive end by a wire to the head of an iron nail. The wire then coils aground the nail to its ti
p and from there to the negative end of the battery. Predict what would happen to the strength of the electromagnet in each situation.
Using a battery with a higher voltage:
Wrapping the wire around the nail only three times:
Changing the direction of the current by reversing the battery connections:
Using a plastic stick in place of the iron nail:
Holding the nail vertically rather than horizontally: it
