The figure shows a system of three positive point charges. A list of 7 changes t

Question

The figure shows a system of three positive point charges. A list of 7 changes to the system are indicated below and are labeled 1- 7. Each change is to be considered a modification of the original situation. For each change, indicated how the electric potential at point P will be affected.

This change will a. increase the electric potential at point P. b. decrease the electric potential at point P. c. not affect the electric potential at point P. d. The effect of this change cannot be determined with the information given. If you choose (d), please explain why you think this.

1. One of the charges is removed. 2. The magnitude of one of the charges is increased. 3. The sign of one of the charges is changed to the opposite sign. 4. The sign of one of the charges is changed to the opposite sign and its magnitude doubled. 5. The magnitude of one f the charges is doubled while another is removed. 6. The distance between two of the charges is decreased. 7. The signs of all three charges are changed to the opposite sign

It is #3 at this link for the figure..

http://astro1.panet.utoledo.edu/~kshan/phys2080/pdf/2080HW2_S2011.pdf

Explanation / Answer

1) b (less +ve charges to create potential) 2) a (magnitude of potential will increase) 3) b (negetive charge will create negetive potential) 4) b (negetive charge will create negetive potential) 5) d (you need to know which is doubled and which is removed, because distances for all three charges is not the same. 6) a (distance with P will also be reduced) 7) b (potential will be same but negetive)

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