(a(i))[2]
Define electric potential at a point in space.
(a(ii))[2]
State how electric potential and electric field strength are related at a point.
(b(i))[2]
The helium nucleus is free to move between the plates. Using the energy changes of the helium nucleus, explain why the speed at which it reaches plate B does not depend on the separation of the plates.
(b(ii))[3]
As the helium nucleus ($^{4}_{2}\text{He}$) travels from plate A towards plate B, its distance $x$ from plate A increases. Calculate the speed of the nucleus after it has travelled a distance $x = 0.40\,\text{cm}$ from plate A.