In an electron gun the control grid is given a negative potential relative to cathode in order to
In an electron gun the control grid is given a negative potential relative to cathode in order to
- A
Decelerate electrons
- B
Repel electrons and thus to control the number of electrons passing through it
- C
To select electrons of same velocity and to converge them along the axis
- D
To decrease the kinetic energy of electrons8.
Similar Questions
When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)
- [AIPMT 2010]
What is specific charge ? Write its standard value.
What is specific charge ? Write its standard value.
Order of q/m ratio of proton, $\alpha $ -particle and electron is
Order of q/m ratio of proton, $\alpha $ -particle and electron is
Kinetic energy of emitted cathode rays is dependent on
Kinetic energy of emitted cathode rays is dependent on