Question

Stopping potential is the negative voltage on the collector plate at which the photoelectric current just becomes __________.

• A. $>V$
• B. $<V$
• C. $Zero$
• D. None of the above

Answer 1

The correct option is C $Zero$

The negative potential of the collector plate at which the photoelectric current becomes zero is called stopping potential or cut - off potential. Stopping potential is that value of retarding potential difference between two plates which is just sufficient to halt the most energetic photo electron emitter, it is denoted by $V_0$ .