In Figure 4.27 four particles form a square of edge length
a=5cm and have charges q1=+10nc, q2=-20nc,q3 = +20nc, q4=-10.0nc. In unit-rector notation, what net
electric field do the particles produce at the centre of square?
![In Figure 427 four particles form a square of edge lengtha5cm and have charges q110nc q220ncq3 20nc q4100nc In unitrector notation what netelectric field do the class=](https://us-static.z-dn.net/files/d7f/e9d766e88811df44368f315c9e623e7e.jpg)