Magnetic Flux

• What is the process of inducing an e.m.f in a conductor called?

  Electromagnetic induction
• What is required for electromagnetic induction to occur?

  Relative movement between a charge and a magnetic field
• How can electromagnetic induction be observed?

  Using a magnet and a coil or solenoid
• When does a conductor induce an e.m.f?

  When it cuts through magnetic field lines
• What determines the amount of e.m.f induced?

  The magnetic flux
• How does magnetic flux vary in a coil?

  It varies as the coil rotates within the field
• What is the definition of magnetic flux?

  Total magnetic field passing through an area
• When is magnetic flux at its maximum?

  When magnetic field lines are perpendicular to the area
• When is magnetic flux zero?

  When magnetic field lines are parallel to the area
• What is the formula for magnetic flux?

  Φ = BA
• What do the symbols in the magnetic flux formula represent?

  Φ = magnetic flux, B = flux density, A = area
• How is magnetic flux calculated?

  By multiplying magnetic flux density and area
• What is the cross-sectional area of an aluminium window frame with width 40 cm and length 73 cm?

  $0.292 \text{ m}^2$
• What is the magnetic flux through the window when it is closed?

  $5.3 \times 10^{-6} \text{ Wb}$
• What happens to magnetic flux as the window is opened and rotated?

  • Minimum at 90 degrees
  • Maximum when fully closed or opened to 180 degrees

  
• What is the significance of the angle θ in magnetic flux calculations?

  It is the angle between field lines and normal

  
• How can visualizing the normal help in magnetic flux problems?

  It helps to determine the correct angle θ