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Investagate the strength of an electromagnet

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The aim of the experiment is to investagate the strength of an electromagnet


An electromagnet is a coil of wire wound on a soft iron core. Unlike refrigerator or bar magnets, electromagnets use electricity to generate a magnetic field. In addition, electromagnets give us the ability to turn the magnetic field on or off as we need.

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accidentally discovered that a wire with electricity running though it made a compass deflect from the Earth's North Pole. In fact, the compass needle was perpendicular to the direction of the electric flow. That meant that the electricity flowing in the wire generated its own magnetic field that was disrupting the nearby compass!
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The variables in this experiment are the current, resistance.

Prediction and hypothesis

My prediction is that if I increase the voltage/current the strength of the electromagnet will increase.this is

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