Revision: Electrostatics Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 14 Electrostatics - Revision Quiz Test your understanding of Electrostatics here: 1 / 5 1) Three insulated uncharged metal spheres P, Q and R are placed in contact as shown in the following figure. A negatively charged polythene rod is held near P. Sphere Q is touched by a finger momentarily with the rod held in the same place. The spheres are then separated as shown below. What is the charge on P, Q and R after they are separated? B D A C 2 / 5 2) Two negatively charged spherical bobs are suspended from the ceiling as shown below. If an earthed metal plate is inserted between the bobs as shown below, the bobs will move further away from each other. remain in the same positions. move closer to each other. move inwards to touch the plate then repel from each other. The earthed plate will become positively charged (by induction) and hence attract both sphere a little towards the centre. 3 / 5 3) A charged plastic rod is placed close to a neutral metal sphere suspended freely on an insulating thread. Which of the following statements describes the force between the rod and the sphere? The direction of the force depends on the sign of the charge on the charged rod. There is no force between them. The force between them is always repulsive. The force between them is always attractive. 4 / 5 4) The diagram shows the electric field around two charged spheres. Which two charges would produce this pattern? 5 / 5 5) A small negative charge is placed at X, within a system of two identical positive charges as shown below. Which of the arrows below best shows the direction of the net electrostatic force acting on a small negative charge placed at X? D C B A Your score is Restart quiz
