A) 15 eV
B) 2 eV
C) 85 eV
D) 30 eV
Correct Answer: B
Solution :
Grid is at 3 V negative potential w.r.t. cathode hence it will repel electron (negatively charged). Due to this reason, electron will experience a loss of 3 eV in it energy to reach the grid. Hence when it reaches at grid, the KE of electron \[=5\text{ }eV-3\text{ }eV=2\text{ }eV\]You need to login to perform this action.
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