Electromagnetic Induction
This lesson covers:
- How the generator effect / electromagnetic induction works
- The three ways to increase the size of the induced potential difference
A potential difference is generated when a wire experiences a in magnetic field.
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Which of the following would generate a potential difference in a wire?
(the wire is within the magnetic field of a nearby magnet)
Only moving the magnet
Only moving the wire
Moving either the wire or the magnet
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A wire moving up and down repeatedly perpendicular to a magnetic field will:
Generate a constant potential difference
Generate an alternating potential difference
Not generate a potential difference
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A wire moving parallel to a magnetic field will:
Generate an alternating potential difference
Generate a constant potential difference
Not generate a potential difference
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Name the three ways to increase the size of the potential difference generated in electromagnetic induction
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constant / changing / voltage / current
- When a wire experiences a magnetic field, a potential difference will be induced across the wire.
- If the ends of the wire are connected to make a closed circuit, then a will flow around the circuit.
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Moving a magnet into or out of a solenoid will induce a potential difference across the wire.
But a current will only flow if it's a closed circuit (which means that the wire forms a complete loop).