#### A charged particle moves through a magnetic field perpendicular to its direction. Then Option 1) kinetic energy changes but the momentum is constant Option 2) the momentum changes but the kinetic energy is constant Option 3) both momentum and kinetic energy of the particle are not constant Option 4) both, momentum and kinetic energy of the particle are constant

As we learnt in

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Due to Lorentzian force, , When a charged particle enters a field with its velocity perpendicular to the magnetic field, the motion is circular with     constantly changes its direction (but not the magnitude). Therefore its tangential momentum changes its direction but its energy remains the same

Option 1)

kinetic energy changes but the momentum is constant

Incorrect option

Option 2)

the momentum changes but the kinetic energy is constant

Correct option

Option 3)

both momentum and kinetic energy of the particle are not constant

Incorrect option

Option 4)

both, momentum and kinetic energy of the particle are constant

Incorrect option