A charged particle moves through a magnetic field perpendicular to its direction. Then (a) Kinetic energy changes but the momentum is constant (b) the momentum changes but the kinetic energy is constant (c) both momentum and kinetic energy of the particle are not constant (d) both momentum and kinetic energy of the particle are constant

Answer: (b). Magnetic force ⊥ v: no work, so speed and kinetic energy stay constant. Direction of velocity keeps changing, so momentum (a vector) changes. So the answer is (b).

A charged particle moves through a magnetic field perpendicular to… | JEE Main 2007 (AIEEE)

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Moving Charge in a Magnetic Field

A charged particle moves through a magnetic field perpendicular to its direction. Then

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Answer: (b)

Magnetic force $\perp \vec{v}$ : no work, so speed and kinetic energy stay constant.
Direction of velocity keeps changing, so momentum (a vector) changes.
So the answer is (b).

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