Question

If the an electron is placed at one of the three points above, which of the following statement is true?

• A. The electron will experience a greater upward acceleration at point I than at point II
• B. The electron will experience a greater downward acceleration at point II than at point I
• C. The electron will experience the same upward acceleration at point I, II ,and III
• D. The electron will experience the same downward acceleration at point I, II ,and III
• E. The electron will experience no acceleration at point I,II, or III

Answer 1

The correct option is C The electron will experience the same upward acceleration at point I, II ,and III

Due to the applied potential difference across the plates with distance, say $d$, between them, an electric field exists between them with magnitude $\frac{V}{d}$ which is uniform at all points direction in downwards direction.

The force acting on an electron placed between the plates is $(-e)E$, which is independent of the location of the electron.

Hence all the electrons experience same force, thus same acceleration, upwards.