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

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

continuous conducting path for current, power supply