Electromagnetism
Overzicht
Every electric motor, every loudspeaker and every MRI scanner relies on the same principle: a current flowing through a magnetic field experiences a force. Electromagnetism connects electricity to magnetism and puts that connection to work in devices you use every day.
In this lesson you will trace the magnetic field around a current-carrying wire, build it into a solenoid, strengthen it into an electromagnet, and then apply Fleming's left-hand rule to predict forces. You will see how those forces drive a d.c. motor and make a loudspeaker cone vibrate to produce sound.
Doelstellingen
- Know that an electric current in a conductor produces a magnetic field around it
- Describe the construction of electromagnets
- Draw magnetic field patterns for a straight wire, a flat circular coil and a solenoid when each is carrying a current
- Know that there is a force on a charged particle when it moves in a magnetic field as long as its motion is not parallel to the field
- Understand why a force is exerted on a current-carrying wire in a magnetic field and how this effect is applied in simple d.c. electric motors and loudspeakers
- Use the left-hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field
- Describe how the force on a current-carrying conductor in a magnetic field changes with the magnitude and direction of the field and current
Mindmap
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Flashcards
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Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Electromagnetism. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- What shape is the magnetic field around a straight current-carrying wire? A) Straight parallel lines B) Concentric circles C) Radial lines pointing outward D) A single loop Answer: B
- Which of the following will NOT increase the strength of an electromagnet? A) Increasing the current B) Adding more turns to the coil C) Using a copper core D) Using a soft iron core Answer: C
- In Fleming's left-hand rule, what does the thumb represent? A) Current B) Magnetic field C) Force D) Voltage Answer: C
- A wire carries a current of 6.0 A through a 0.50 T field. The wire is 0.20 m long. What is the force on the wire? A) 0.06 N B) 0.60 N C) 6.0 N D) 60 N Answer: B
- What is the role of the split-ring commutator in a d.c. motor? A) It increases the current B) It reverses the current direction every half-turn C) It strengthens the magnetic field D) It provides the power supply Answer: B
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Aanbevolen Boeken
Verder leren met open bronnen
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Leerboekparagraaf
Magnetic Fields, Field Lines, and Force
Summarize properties of magnets and describe how some nonmagnetic materials can become magnetized
"Physics: Magnetic Fields, Field Lines, and Force" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/20-1-magnetic-fields-field-lines-and-force. Access for free at https://openstax.org/books/physics/pages/1-introduction
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Leerboekparagraaf
Torque on a Current Loop: Motors and Meters
Motors are the most common application of magnetic force on current-carrying wires. Motors have loops of wire in a magnetic field. When current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft. Electrical energy is converted to mechanical work in the
"College Physics: Torque on a Current Loop: Motors and Meters" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/22-8-torque-on-a-current-loop-motors-and-meters. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
Gepubliceerd door andere organisaties onder open licenties, vermeld zoals zij vragen. Links openen hun websites.
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