**Goal:** Link work and potential change

**Source:** 283-450 Move q, do most work

For

the following situations consider moving a positive charge from very far

away to the origin along the y-axis. For which situation would you do

the most work?

- A
- B
- C
- D
- A & C
- None of the above.
- Cannot be determined

## Commentary:

## Answer

(1) Students indicating #7 because they do not know if the masses

are charged should not be disconfirmed. If students key on magnitude

only they will likely choose answer #5.