Magnetic Fields and Ampere’s Law
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Questions and Answers

What did Oersted discover in 1820?

  • A current in a wire affected a compass needle (correct)
  • The direction of a current-created field is unrelated to the direction of the current
  • Electric power lines interfere with compass readings
  • The shape of wires carrying current affects the shape of the magnetic field created

    • How is the shape of wires carrying current related to the shape of the magnetic field created?

  • A toroid (doughnut) creates a magnetic field similar to that of a bar magnet
  • The shape of wires carrying current has no effect on the shape of the magnetic field created
  • A straight wire creates a magnetic field similar to that of a bar magnet
  • A current loop creates a magnetic field similar to that of a bar magnet (correct)

    • How is the direction of a current-created field related to the direction of the current?

  • The direction of a current-created field is related to the direction of the current (correct)
  • The direction of a current-created field is opposite to the direction of the current
  • The direction of a current-created field is unrelated to the direction of the current
  • The direction of a current-created field is perpendicular to the direction of the current

    • How can one explore the direction of a magnetic field around a long straight wire?

    <p>Using compasses</p> Signup and view all the answers

    What can determine the magnitude of the magnetic field around a long straight wire?

    <p>Using Hall probes</p> Signup and view all the answers

    What is one way to explore the direction of a magnetic field around a long straight current-carrying wire?

    <p>Using compasses</p> Signup and view all the answers

    What did Oersted discover in 1820 regarding the effect of a current in a wire on a compass needle?

    <p>The current in a wire affected a compass needle</p> Signup and view all the answers

    What type of field is created around a long straight wire carrying current?

    <p>A field in circular loops</p> Signup and view all the answers

    How does the shape of wires carrying current affect the shape of the magnetic field created?

    <p>It varies depending on the shape of the wire</p> Signup and view all the answers

    What is one way to determine the magnitude of the magnetic field around a long straight wire?

    <p>$Hall$ $probes$</p> Signup and view all the answers

    Study Notes

    Hans Christian Oersted's Discovery

    • In 1820, Oersted discovered that an electric current in a wire affects a nearby compass needle, demonstrating the existence of a magnetic field around the wire.

    Magnetic Field Shape and Wire Shape

    • The shape of the wire carrying current affects the shape of the magnetic field created around it.

    Current Direction and Magnetic Field Direction

    • The direction of the magnetic field created by a current is related to the direction of the current.

    Exploring Magnetic Field Direction

    • One way to explore the direction of a magnetic field around a long straight wire is to use a compass needle.

    Magnetic Field Magnitude

    • The magnitude of the magnetic field around a long straight wire can be determined by thestrength of the current and the distance from the wire.

    Type of Field Created

    • A long straight wire carrying current creates a magnetic field around it.

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    Description

    Explore the concept of magnetic fields produced by currents and Ampere’s Law. Discover the current needed to generate a magnetic field comparable to the Earth's, and its impact on compass readings near electric power lines.

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