An electron moving with uniform velocity in \( \mathrm{x} \)-direction enters a region of unifor...

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An electron moving with uniform velocity in \( \mathrm{x} \)-direction enters a region of uniform magnetic field along y-direction. Which of the following physical quantity(ies) is (are) nonzero and remain constant?
[NTSE 2013]
A. Velocity of the electron
B. Magnitude of the momentum of the electron.
C. Force on the electron.
D. The kinetic energy of electron.
a. Only (A) and (B)
b. Only (C) and (D)
c. All four
d. Only (B) and (D)
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