1) 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?

2) The diagram shows the electric field near a point charge and two electrons X and Y.

Which best describes the forces acting on X and Y?

3) An electron, travelling horizontally at constant speed in a vacuum, enters a vertical electric field between two charged parallel plates as shown.

What are the horizontal and vertical components of the motion of this electron when it is in the field?

4) The force of attraction between two unlike charges is 1.5 N. If the distance between the charges is doubled, what is the force of attraction between them?

5) The diagram shows two plates J and K, a distance 0.080 m apart in a vacuum. An electron, originally at rest, is accelerated by a uniform electric field of 3.0 × 10⁵ N C^–1 from K to J. What is the gain in the electron‚Äôs kinetic energy? Ignore the weight of the electron and take the magnitude of the charge of the electron to be 1.60 × 10^–19 C.