An electron is moving with constant velocity along $x - $ axis. If a uniform electric field is applied along $y - $ axis, then its path in the $x - y$ plane will be
A straight line
A circle
A parabola
An ellipse
Positive rays consists of
Particle nature and wave nature of electromagnetic waves and electrons can be shown by
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
The mass of the electron varies with
In an electron gun the control grid is given a negative potential relative to cathode in order to