Question

In a CRT the acceleration of electrons is controlled by changing ________ between the cathode and anode.

• A. potential difference
• B. space
• C. temperature
• D. none of these

Answer 1

The correct option is A potential difference

Positive potential is given to anode and negative potential is given to cathode. As a result of this potential difference, electrons generated by heating cathode are attracted towards anode due to this potential difference. If no potential difference is applied b/w anode and cathode in CRT, no electron would strike the screen. It is because of this potential difference b/w anode and cathode that the whole process occurs.