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An alpha particle is made to move through two plates 10 cm apart. The speed with which it enters…

Physics20253 marksLong answer
An alpha particle is made to move through two plates 10 cm apart. The speed with which it enters the gap in the first plate is $2.5 \times 10^6\text{ m s}^{-1}$. The particle exits the second plate with a velocity of $5 \times 10^6\text{ m s}^{-1}$.
(a)
Calculate the potential difference between the plates.
(b)
Calculate the electric field between the plates.
(c)
Name a device where this principle is used.

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Electrostatic Potential, Potential Energy and Capacitance

From ISC 2025 Practice Physics, question 79.