Class 12 Physics Electromagnetic Induction Magnetic Flux

Magnetic Flux

  • Magnetic flux is defined as the product of the average magnetic field times the perpendicular area it penetrates.
  • In case of magnetic flux orientation of the area vector is considered.
  • Area vector is considered as the amount of lines crossing an area also varies with the orientation of the area.
  • It is a scalar quantity.
  • Magnetic flux is denoted by ΦB or Φ.
  • I Unit- Weber (Wb).
    • Where 1Wb= 1Tesla x 1m2 (S.I. unit of B = Tesla and Area=m2)
  • G.S unit-Maxwell (Mx).Relationship between Weber and Maxwell is;1Wb=108Mx
  • Mathematically:
    • ΦB = A
      • B=magnetic field vector, A= area vector
      • Area vector =In case of magnetic flux the amount of lines crossing an area varies with the orientation of the area.
    • ΦB = BA cos θ
      • Where θ=angle between magnetic field and area vector.
  • Direction of area vector is determined by the normal to the area vector.

Case 1: When the angle between the area vector and the magnetic field (θ)= 900.

  • Therefore, ΦB = 0 as cos900 =0.

 

Case 2: When the angle between the area vector and the magnetic field (θ)= 00.

  • Therefore,ΦB = BA as cos 0=1.

 

 

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