1.      Three particles with charges 2Q, -2Q and -6Q, each at a distance of d from the origin are positioned as shown in the figure. In the origin is located a charge of 4Q. Determine the electric force on the charge at the center.

 

 

 

 

 

 

 

 

 

 

 2.      A certain charge Q is divided into two parts q and Q-q, which is then separated by a certain distance. What must q be in terms of Q to maximize the electrostatic repulsion between the two charges?  

 3.      A thin non-conducting rod of length 10.0 cm has a charge density distribution of 4.00 mC/m. A point charge of 0.2 mC is placed at a distance of 15.0 cm from the near end of the charge distribution and along the same line. Find the force on the charge distribution. 

 

 

 

4.      Three particles with charges 2Q, -2Q and -6Q, each at a distance of d from the origin are positioned as shown in the figure. Determine the electric filed at the origin.

 

 

 

 

 

 

 

 

 

 

 5.      A plastic rod having uniformly distributed charge -Q is bent to a 140 degree circular arc of radius r. What is the electric field due to the rod at the center of curvature of the arc?

 6.      A thin non-conducting rod of finite length L has a charge +q spread uniformly along it. Show that the magnitude of the electric field at a point P along the bisector of the rod is E = (q/2pe_oy) (1/L²+4y²)^1/2.

 

 

 

 

 

 

7.      A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 2.0 cm away, in a time 1.5 x 10^-8 s. a) What is the speed of the electron as it strikes the second plate? b) What is the magnitude of the electric field?