Using the fence technique the problem is in the picture hurry please

Ascientific blank must be testable and capable of being proven false?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine