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Unit 11 · Motor effect

Magnetic field around a current carrying straight wire Presentation

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Science and Technology, Grade 10 · Unit 11

Magnetic field around a current carrying straight wire

Oersted, 1820 · Circular field · Right-hand thumb rule

By the end of this lesson you can

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Describe Oersted's discovery and what it proved

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Show the circular field around a straight wire with compasses and iron filings

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Find the field's direction with the right-hand thumb rule

What Oersted saw

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Current on: the needle turns from north
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Current off: the needle returns to north
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Current reversed: the needle turns the other way
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Conclusion: current produces a magnetic effect

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Presenter notes: Today we look at what happens around an ordinary wire when current flows in it. Start with a question: can a battery and a wire turn a compass?