Electrostatic Images

                                                            

Conductor Simulation

Charge Simulation 

Description

The simulation on the left represents a positive charge (+q) near two infinite grounded conducting sheets. The animation on the right depicts a similar situation without the conductor present. The rectangles are there for your reference only.

Question

Use the animation on the right to place charge(s) where they belong to make the field on the right match the field on the left for the middle region, 0.75>x>-0.75 (the region where the +q is located). Assuming you could do this, where are the charge(s)?  

 

Instructor Resources

Answer: There are an infinite number of charges needed. Just in case your students get too enamored with the method of images, this problem will help point out the limitations in the method.
Script Author: Mario Belloni