Commutator and Magnetic Dipole Quiz
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Questions and Answers

What is the formula to calculate torque?

  • R plus F
  • R multiplied by F
  • R divided by F
  • R cross F (correct)
  • In an electric motor, what keeps the current-carrying loop rotating?

  • Electric field
  • Gravity
  • Inertia
  • Magnetic field (correct)
  • What happens when the loop in an electric motor is slightly moved from the equilibrium point?

  • It experiences forces pushing it back to equilibrium (correct)
  • It speeds up
  • It changes its color
  • It stops moving
  • Which position results in unstable equilibrium for a loop in a magnetic field?

    <p>Loop perpendicular to the magnetic field</p> Signup and view all the answers

    What is the torque of a current (I) times area (A) times magnetic field (B) known as?

    <p>$I \times A \times B$</p> Signup and view all the answers

    How does switching the direction of the current in an electric motor affect the loop?

    <p>Reverses the forces acting on the loop</p> Signup and view all the answers

    When is there no torque on a current-carrying wire in a magnetic field?

    <p>When the loop is perpendicular to the magnetic field</p> Signup and view all the answers

    What causes a torque on a magnetic dipole?

    <p>Magnetic field</p> Signup and view all the answers

    What is used in an electric motor to change the direction of forces acting on a current-carrying loop?

    <p>Brushes</p> Signup and view all the answers

    In which position is there stable equilibrium for a loop in a magnetic field?

    <p>Loop parallel to the magnetic field</p> Signup and view all the answers

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