Physics q140

140An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following physical quantity(ies) is(are) non zero and remain constant?

I. Velocity of the electron.
II. Magnitude of the momentum of the electron.
III. Force on the electron.
IV. The kinetic energy of electron. (NTSE Stage-II,2012-13), (NTSE, Jharkhand, Stage-I, 2016-17)

Option : D
Explanation :

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