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:
Selection 1:stronger force of attraction
Selection 2:weaker force of attraction
Selection 4:weaker force of attraction