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41: Electro-Magnets: Poles and Magnetic Fields |
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40: Electro-Magnets: Creating Magnetism with Electric Current |
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39: Creating Movement with Magnetism |
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38: Attraction of Magnetic Substances |
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37: Magnetic Fields and Permanent Magnets |
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36: Magnetism Terminology |
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35: Introduction to Magnetism |
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34: How Variable Resistors Are Used for Modern Throttle Control Systems |
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33: Variable Resistors: Function and Construction |
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32: Introducing Variable Resistors |
