1) Two oppositely-charged parallel plates are arranged as shown.

An electron is released from rest from the surface of the negatively-charged plate. The electron travels from the negatively-charged plate towards the positively-charged plate.

Which graph shows how the force F on the electron varies with its distance x from the negative plate?

2) 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?

3) 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?

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.