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Electromagnets
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Magnetic Field Lines We can represent the magnetic field around a wire or magnet using field lines.
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Magnetic Field Lines The arrows show the direction a compass needle would point at that point in the field.
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Field around a magnet
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Moving charges (currents)
Moving charges (electric currents) also produce a magnetic field Conventional current – electrons flow in the opposite direction
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Magnetic field around a straight conductor
Current OUT of page Current IN to page You can use the right hand screw rule to decide which direction the field goes
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Electromagnets
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Field around a solenoid
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Field around a solenoid
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Electromagnets
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To make an electromagnet stronger
The 3 C’s More Coils More Current Use an iron Core
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The experiment You will make a simple electromagnet by wrapping insulated wire around an iron nail and connecting it to a 1.5 V cell. You will start with 100 turns and increase the number of turns by 50 at a time. For each measurement you will be testing how many paperclips the electromagnet can pick up. The more paperclips, the stronger the magnet is.
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To do list: Title Prediction Equipment List
Labelled diagram - use pencil!!! Procedure (bullet-pointed) Results Table (make room for repeats) - use pencil!!!
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