- 297

- 6

**1. Homework Statement**

**2. Homework Equations**

See above

**3. The Attempt at a Solution**

In the solutions guide for problem 71, if a charge is negative (look at the -1.5 C charge), it will be negative in the equation for potential energy (last step where multiplication brings 1.5J. On the other hand, in question 26, the solution guide takes the absolute value. Is there a general guide to when I should take the absolute value of a negative charge or if I should plug in the negative number into the formula. Thank you