Tri 4. Predict what would happen if you touched the knob
of a positively charged electroscope with another
positively charged object.

If you touch the knob of a positively charged electroscope with another positively charged object,the leaves of the electroscope would remain apart.

more info ? ? i don't understand what the question is

explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.