A negatively charged Particle enters a region in which there is a uniform magnet

Question

A negatively charged Particle enters a region in which there is a uniform magnetic field the velocity of the particle is initially perpendicular to the field Explain how each of the changes described below would affect the particle's change of kinetic energy during the first 3 seconds it is In the field. The initial speed of the particle is reduced to half. the particle is initially moving at an angle of 60'relative to the direction of the magnetic field. The particle is replaced with a particle of identical charge, but double the mass.

Explanation / Answer

Case a) If the initial velocity is perpendicular to the magnetic field, and the magnetic field is uniform, then the kinetic energy of the particle is constant. As EK=mVo2/2=mV2(3 s)/2, if Vo is reduced to half then EK is reduced to half to.

Case c) As is case a), EK is constant so if m is doubled the EK is doubled to.

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