Electromag.

• What does the magnetic field of a permanent magnet describe?

  The area around the magnet where magnetic forces act
• How is the magnetic field around a long straight wire described?

  Using the Right-Hand Grip Rule
• What is the Motor Effect in electromagnetism?

  The force on a current-carrying wire in a magnetic field
• What does Fleming’s Left-Hand Rule help determine?

  The direction of magnetic force on a wire
• What is magnetic flux density represented by?

  B
• What is the equation for magnetic flux?

  $\Phi =$$BA \cos \theta$
• What does the split-ring commutator do in a DC motor?

  Reverses the current direction in the coil
• How do you calculate the maximum torque in a coil?

  Using the magnetic field strength and current
• What is the magnetic field strength around a straight wire?

  Determined by the current flowing through it
• What is the magnetic field strength within a solenoid?

  Stronger than that around a straight wire
• What happens to magnetic field lines inside a magnet?

  They travel from South Pole to North Pole
• How do two North Poles interact?

  They repel each other
• Why do we label magnetic poles as North and South?

  North-seeking and South-seeking poles
• What does the Earth's magnetic field behave like?

  A bar magnet with poles
• What is the effect of wrapping a wire into a coil shape?

  It increases the magnetic field strength
• What happens when a wire carrying current is placed between magnetic poles?

  It experiences a magnetic force
• What does the term "conventional current" refer to?

  Current flowing from positive to negative
• How does the magnetic field behave around a straight wire?

  It forms concentric circular lines
• What is the relationship between the direction of current and magnetic field lines?

  They are perpendicular to each other
• What does the end-view of a straight wire show?

  The direction of the magnetic field lines
• What is the significance of the North Pole in a magnet?

  It indicates the direction of magnetic field lines
• What happens when current flows through a wire in a magnetic field?

  The wire experiences a force
• What does the interaction between magnetic fields and current-carrying wires demonstrate?

  The principle of the Motor Effect
• How can the direction of the magnetic force be predicted?

  Using Fleming’s Left-Hand Rule
• What is the role of the magnetic field in the Motor Effect?

  It interacts with the current to produce force
• What happens to the magnetic field when the current direction changes?

  The direction of the magnetic field reverses
• What is the effect of increasing the current in a wire on the magnetic field?

  The strength of the magnetic field increases
• What is the relationship between magnetic field strength and distance from the wire?

  It decreases with increasing distance
• How does the magnetic field behave inside a solenoid?

  It is uniform and strong
• What is the purpose of using a magnetic material inside a solenoid?

  To enhance the magnetic field strength
• What does the term "Motor Effect" refer to in electromagnetism?

  The force on a current-carrying conductor
• What is the significance of the direction of the magnetic field in the Motor Effect?

  It determines the direction of the force
• How does the magnetic field interact with the current in the Motor Effect?

  It produces a force that moves the wire
• What happens to the magnetic field lines when two magnets are brought close together?

  They interact based on the poles' orientation
• What is the effect of placing a conductor in a magnetic field?

  It experiences a force if current flows
• What does the interaction between magnetic fields and electric currents illustrate?

  The principles of electromagnetism
• How does the magnetic field behave around a solenoid?

  It resembles that of a bar magnet
• What is the role of the North Pole in a magnet?

  It indicates the direction of magnetic field lines
• What happens to the magnetic field when the current is turned off?

  The magnetic field disappears
• What is the significance of the South Pole in a magnet?

  It attracts the North Pole of other magnets