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Physics - Magnetic Effects Of Current

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11. An 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)

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12. In electromagnetic wave, the direction of electric and magnetic field are (NTSE West Bengal, Stage-I, 2014-15)

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13. How many times does the polarity of an A.C. supply of frequency 50 Hz change in one second? (NTSE West Bengal, Stage-I, 2014-15)

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14. A rectangular coil of copper wire is rotated in a magnetic field. The direction of the induced current changes once in each (NTSE Bihar, Stage-I, 2014-15)

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15. A high energy electron enters into a strong magnetic field which is perpendicular to its velocity plane. In which path is it expected to move? (NTSE Bihar, Stage-I, 2014-15)

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Magnetic Effects Of Current