Physics: Forces Between Currents in Jumper Cables
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Questions and Answers

What is the primary purpose of a set of jumper cables?

  • To boost the voltage in a running vehicle
  • To generate a magnetic field
  • To measure the current in a circuit
  • To start a car with a dead battery (correct)

    • What is the direction of the force on the black wire due to the current in the red wire?

  • In the same direction as the current in the red wire
  • Perpendicular to the current in the red wire
  • Zero, since the wires are not moving
  • In the opposite direction of the current in the red wire (correct)

    • To find the force on the red wire, what two-step process is used?

  • Find the electric field due to the current in the black wire, then find the torque on the red wire
  • Find the force on the black wire, then find the torque on the red wire
  • Find the torque on the black wire, then find the force on the red wire
  • Find the magnetic field due to the current in the black wire, then find the force on the current in the red wire (correct)

    • Why is the force on the black wire equal in magnitude but opposite in direction to the force on the red wire?

    <p>Because of Newton's Third Law</p> Signup and view all the answers

    What is the effect of increasing the separation distance between the wires on the force between them?

    <p>The force decreases</p> Signup and view all the answers

    What is the current in each wire of the jumper cables?

    <p>150 A</p> Signup and view all the answers

    What is the direction of the magnetic field at the position of the red wire due to the current in the black wire?

    <p>Into the page</p> Signup and view all the answers

    What is the direction of the force on the red wire?

    <p>Away from the black wire</p> Signup and view all the answers

    Why are the forces between currents not an important consideration in most cases?

    <p>Because they are typically very small</p> Signup and view all the answers

    What is the significance of the direction of the currents in the two wires?

    <p>It determines the type of force (repulsive or attractive)</p> Signup and view all the answers

    What is an example of a situation where the forces between currents are important?

    <p>An MRI solenoid</p> Signup and view all the answers

    What law is illustrated by the repulsive force between the two wires?

    <p>Newton's Third Law</p> Signup and view all the answers

    A horizontal wire can be levitated against gravity if the current flows in which direction?

    <p>Right to left</p> Signup and view all the answers

    What is the direction of the magnetic force on a wire in a magnetic field?

    <p>Perpendicular to the wire and the magnetic field</p> Signup and view all the answers

    Why does a current to the east result in an upward force on the power line?

    <p>Because the current is perpendicular to the magnetic field</p> Signup and view all the answers

    What is the equation used to calculate the magnitude of the magnetic force on a wire?

    <p>F = ILB sin θ</p> Signup and view all the answers

    What is the typical current carried by a DC power line near the equator?

    <p>850 A</p> Signup and view all the answers

    What is the mass of the heavy cable in the example?

    <p>1000 kg</p> Signup and view all the answers

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