sora is testing how electric forces can change. she charges two rubber balloons with equal amounts of…

Explanation:

Step1: Recall Coulomb's law

The electric - force between two charged objects is given by $F = k\frac{q_1q_2}{r^2}$, where $k$ is the Coulomb's constant, $q_1$ and $q_2$ are the charges of the two objects, and $r$ is the distance between them.

Step2: Analyze the initial situation

Let the initial charges on the two balloons be $q_1 = q$ and $q_2 = q$, and the distance $r$ is constant. So the initial force $F_1=k\frac{q\times q}{r^2}=k\frac{q^{2}}{r^2}$.

Step3: Analyze the final situation

After doubling the charge on one of the balloons, $q_1 = 2q$ and $q_2 = q$ (while $r$ remains the same). Then the final force $F_2=k\frac{(2q)\times q}{r^2}=2k\frac{q^{2}}{r^2}$.

Step4: Compare the initial and final forces

We can see that $F_2 = 2F_1$.

Answer:

C. The electric force is doubled.