Lorentz Force, About Lorentz Force, Formula of Lorentz Force (For CBSE, ICSE, IAS, NET, NRA 2022)

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  • The Lorentz Force is the Force on a Charged Particle Due to Electric and Magnetic Fields.
  • A Charged Particle in an Electric Field Will Always Feel a Force Due to this Field.
  • Hendrik Antoon Lorentz was a Dutch physicist who explained the theories related to electromagnetic radiation. He mainly concentrated on the relationship between magnetism, light, and electricity.
  • A Charged Particle in a Magnetic Field Will Only Feel a Force Due to the Magnetic Field if It is Moving Relative to this Field.
  • These Two Effects Are Often Studied Separately, but the Sum of These Two Effects Creates a Force That We Call the Lorentz Force.
  • In the Year 1895, Hendrik Lorentz Derived the Modern Formula of Lorentz Force.

About Lorentz Force

  • It is defined as the combination of the magnetic and electric force on a point charge due to electromagnetic fields.
  • It is used in electromagnetism and is also known as the electromagnetic force.

Formula of Lorentz Force

Formula for the charged particle is as follows


  • F is the force acting on the particle
  • q is the electric charge of the particle
  • v is the velocity
  • E is the external electric field
  • B is the magnetic field

Formula for continuous charge distribution is as follows:


  • dF is a force on a small piece of the charge
  • dq is the charge of a small piece
  • When a small piece of charge distribution is divided by the volume dV, following is the formula:


  • f is the force per unit volume
  • ρ is the charge density

Importance of Lorentz Force

  • It explains the mathematical equations along with physical importance of forces acting on the charged particles that are travelling through the space containing electric as well as magnetic field.
  • This is the importance of the Lorentz force.

Right-Hand Rule

Right-Hand Rule
  • The right-hand rule is useful to find the magnetic force as it becomes easy to visualize the direction as given in Lorentz force law.
  • It is understood that magnetic force is perpendicular to both the magnetic field and charge velocity.

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