An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following quantities is (are) non zero and remain constant? (I) Speed of the electron (II) Momentum of the electron (magnitude) (III) Kinetic energy of the electron (IV) Force of the electron (magnitude) (1) only I and II (2) only III and IV (3) all four (4) only II and IV

An electron moving with uniform velocity in x direction enters a regio

1.	An electron moving with uniform velocity in x direction enters a region of uniform magnetic field along y direction. Which of the following quantities is (are) non zero and remain constant? (I) Speed of the electron (II) Momentum of the electron (magnitude) (III) Kinetic energy of the electron (IV) Force of the electron (magnitude) (1) only I and II (2) only III and IV (3) all four (4) only II and IV
Answer» Correct option is (3) all four

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