Which of the following properties of a proton can change while it moves freely in a magnetic field?

  1. Speed and Mass
  2. Mass and Velocity
  3. Speed and Momentum
  4. Velocity and Momentum

Answer (Detailed Solution Below)

Option 4 : Velocity and Momentum
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CONCEPT:

Protons:

  • A proton is one of three main particles that make up the atom.
  • Protons are found in the nucleus of the atom.
  • This is a tiny, dense region at the center of the atom.
  • Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.
  • Together with neutrons, they make up virtually all of the mass of an atom.

EXPLANATION:

  • As we know that mass is an intrinsic property of any physical object, therefore the mass of the proton will not change. Hence option 1 is incorrect.
  • As we know that when a charged particle moves in a magnetic field it experiences a force.
  • When a proton enters a magnetic field, it starts moving in a circular motion, and as we know that in circular motion speed remains constant whereas velocity keeps on changing.
  • As momentum (p) = mass (m) × velocity (v). Therefore when velocity changes then the momentum of the proton also changes.
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