# Four charges are placed at the corners of a square, where q is positive

See attached file for graph.

Four charges are placed at the corners of a square, where q is positive. Initially there is no charge in the center of the square.

1) Find the work, W required to bring the charge Qf from infinity and place it at the center of the square.

2) Find the magnitude of the electric force on the charge q when it is placed at the center of the square.

3) Find the magnitude of the total electrostatic energy of the system, U.

4) What is the sign of the total energy associated with the five point charges.

This question has the following supporting file(s):

• hw5pbm12.doc
###### File Viewer (Click To Zoom)

Solution Summary

The solution explains the problem and solves for the answers.

\$2.19
• Plain text
• Cited sources when necessary
• Attached file(s)
• s6.doc

Extracted Content from Question Files:

• hw5pbm12.doc

Four charges are placed at the corners of a square, where q is positive. Initially there is
no charge in the center of the square.

1) Find the work, W required to bring the charge Qf from infinity and place it at the
center of the square.

2) Find the magnitude of the electric force F on the charge q when it is placed at the
center of the square.

3) Find the magnitude of the total electrostatic energy of the system, U.

4) What is the sign of the total energy associated with the five point charges.

Q2=
Q1= +q
-q

Qi = 0

a

Qf = +q

Q3=
Q4=
+q
-q