What important physics idea is this question targeting?
This targets whether or not students recognize that an overall charge is generally due to an imbalance of positive and negative charges (with electrons as the charges that tend to move) rather than a creation of charges. (C)
This targets whether students can convey information via visual models. (V)
This problem can let a teacher know if students understand that charges will distribute themselves evenly across the surface of a charged object when it becomes charged. (I)
