1) An electron enters the space between two parallel charged plates with an initial velocity u.

While in the electric field, its direction changes by θ and it emerges with a velocity v. What is the relation between v and u?

2) X and Y are two identical conducting spheres separated by a distance d. X has a charge +6.0 μC and Y has a charge –2.0 μC. The electric force on Y is −F (i.e. attractive).

The spheres are touched together and are then returned to their original separation d.

What is the force on Y now nearest to?

3) The diagram shows an insulating rod with equal and opposite point charges at each end.

An electric field of strength E acts on the rod in a downwards direction.

Which row is correct?

4) Two charges –q and +q are placed at a distance 2d apart.

What is the electric field strength at X, a distance d away from +q?

5) A single proton travelling with a constant horizontal velocity enters a uniform electric field between two parallel charged plates. In the diagram, B shows the path taken by the proton.

Which path is taken by a helium nucleus (two protons and two neutrons) that enters the electric field at the same point and with the same velocity as the proton?