Question

7a. select one limitation of the model comparing gravitational force and electrostatic force. use the model to answer the following question. gravitational force electrostatic force both the gravitational force and the electrostatic force can only attract. the vectors are all the same length indicating that electrostatic force and gravitational force are equal in magnitude. distance between the masses does not have an effect on the gravitational force but the distance between the charges does have an effect on electrostatic force.

Explanation:

1. The first option is incorrect: gravitational force only attracts, but electrostatic force can attract (opposite charges) or repel (like charges), as shown in the model.
2. The third option is incorrect: both gravitational force ($F_g = G\frac{M_1M_2}{d^2}$) and electrostatic force ($F_e = k\frac{Q_1Q_2}{d^2}$) depend on the distance $d$ between the objects/charges.
3. The second option is a limitation: the model uses vectors of equal length, but in reality, electrostatic force is vastly stronger than gravitational force for most common scales, so their magnitudes are not equal.

Answer:

The vectors are all the same length indicating that electrostatic force and gravitational force are equal in magnitude.