Magnetic Force – Class 12 | Chapter – 4 | Physics Short Notes Series PDF for NEET & JEE

Magnetic Force:It is a type of force that arises between electrically charged particles due to their motion. This force is mediated by the electromagnetic field, which is created by moving electrically charged particles. The interaction between moving charges and the electromagnetic field creates a force that can either attract or repel other charges.

The strength of the magnetic force depends on the magnitude of the charges and their relative velocity, as well as the distance between the charges. The direction of the magnetic force is perpendicular to both the direction of motion of the charges and the direction of the magnetic field.

It play a crucial role in many natural phenomena and technological applications, such as the operation of electric motors, generators, and MRI machines.

How To Find Magnetic Force?

The magnitude of the magnetic force (F) on a moving charged particle can be calculated using the following equation:

F = q * v * B

where:

  • q is the charge of the particle (in Coulombs)
  • v is the velocity of the particle (in meters per second)
  • B is the magnetic field strength (in Tesla)

Note that the direction of the magnetic force is perpendicular to both the velocity of the particle and the magnetic field, and can be determined using the right-hand rule.

Characteristics of Magnetic Force

Magnetic force has several important characteristics:

  • Direction: It acts perpendicular to both the velocity of the moving charged particle and the magnetic field.
  • Strength: The strength of the magnetic force depends on the charge of the moving particle, its velocity, and the magnetic field strength.
  • Distance: It decreases with distance, as the magnetic field decreases with distance from the source of the field.
  • Relativity: It is a relativistic effect, meaning its strength depends on the relative velocity of the charged particle and the observer.
  • Additivity: Magnetic force between two charged particles is additive, meaning that the total force on one particle due to multiple other charged particles is the sum of the individual forces.
  • Interaction with other forces: It interacts with other forces, such as electric force and gravitational force, in a variety of ways that are described by the laws of electromagnetism and general relativity.
  • Neutral charges: It does not act on neutral charges, since they do not carry a net electrical charge.
  • Conservation of energy: It conserves energy, meaning that the energy of the system is constant in time, as long as no other forces are acting.


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By Team Learning Mantras