Betty made a simple electromagnet using just a battery and a wire. What could Betty do to increase the strength of her electromagnet? Coil the wire around a nail. Coil the wire around a toothbrush. Coil the wire around a paper towel roll. Coil the wire around a test tube.
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Coil a wire around a nail
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Answer:coil the wire around the nail
Explanation:so as to increase the rate of flowing the current and in order to get more power
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