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Momentum of a system of particles is conserved if-


1. the particles are charged and moving
2. there is no external force acting on the system
3. there is a force provided to the system externally
4. all of the above

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Correct Answer - Option 2 : there is no external force acting on the system

The correct answer is option 2) i.e. there is no external force acting on the system

CONCEPT:

  • Momentum: Momentum is the impact due to a moving object of mass m and velocity v.


The momentum (p) of an object is expressed as:

p = mv

  • Law of conservation of momentumMomentum is conserved for any interaction between objects in an isolated system.
    • ​The conservation of momentum can be observed by analyzing the momentum of the total system or by analyzing the change in momentum.
    • This is done by equating the momentum before the interaction to the momentum after the interaction.


EXPLANATION:

  • According to the law of conservation of momentum, the total momentum of a system is conserved for an isolated system.
  • An isolated system means that there is no external interaction on the system. 
  • Thus, the momentum of a system of particles is conserved if there is no external force acting on the system.

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