(a)[2]
State what the direction of an electric field line tells you.
(b(i))[3]
On Fig. 4.1, draw five lines showing the electric field between the plates.
(b(ii))[2]
Calculate the magnitude of the electric field between the plates.
(c(i))[2]
The proton is deflected by the electric field. On Fig. 4.2, draw a line to show the proton’s path as it travels through the electric field region and then out of it.
(c(ii))[3]
A helium nucleus $^{4}_{2}\text{He}$ now enters the electric field region along the same initial path as the proton and with the same initial speed. State and explain how the final speed of the helium nucleus compares with the final speed of the proton after it leaves the electric field region.