(a(i))[2]
Define the term electric potential at a point.
(a(ii))[2]
State the connection between electric potential and electric field strength at a point.
(b(i))[2]
The helium nucleus is able to move freely between the plates. By using the energy changes of the helium nucleus, explain why the speed when it arrives at plate B is independent of the plate separation.
(b(ii))[3]
As the helium nucleus ($^{4}_{2}\mathrm{He}$) travels from plate A towards plate B, its distance $x$ from plate A gets larger. Calculate the speed of the nucleus after it has moved a distance $x = 0.40\ \text{cm}$ from plate A.