Two charged particles repel each other with a force of F. How would the magnitude of this force change if the charge on one of the particles was doubled?

- it would decrease to one-fourth of what it was.

- it would decrease to half of what it was.

- it would increase to four times what it was.

- it would increase to twice what it was.

it would increase to twice what it was

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.