In the following figure, electric field at y axis will be maximum at y=?

Explanation:

As we know that electric field due to each charge at any given height y due to the point charges is given by

now we know that horizontal component of electric field due to each charge will cancel out while vertical component will be added due to both

So here we can say

now we know that for maximum value of Electric field

after solving this we will have

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

c

explanation: