The predictions of the strength of the
electromagnet in the situation above are:
- Sing a battery with a higher voltage: stronger force of attraction.
- Wrapping the wire around the nail only three times: weaker force of attraction.
What is the influence of number of coil of wire around the nail?
Others are:
- Changing the direction of the current by reversing the battery connections: no change.
- Using a plastic stick in place of the iron nail: weaker force of attraction.
- Holding the nail vertically rather than horizontally: no change.
When there is said to be more loops that the coil has, there is found to be a stronger magnetic field, as the current is flowing.
Note that the predictions of the strength of the electromagnet in each situation given above are true and correct.
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