Figure \(\text{I}\) shows a positively charged particle accelerating freely from \(X\) to \(Y\), between oppositely charged plates. The change in the particle's kinetic energy is \(W\).
The distance between the plates is then doubled as shown in Figure \(\text{II}\) . The same charge accelerates from rest over the same distance from \(X\) to \(Y\).
What is the change in kinetic energy of the positively charged particle shown in Figure \(\text{II}\) ?
- \(W\)
- \(\dfrac{W}{2}\)
- \(\sqrt{W}\)
- \(2 W\)