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The problem involves electric force and how it changes when the charge on one of two rubber balls is altered, while the distance between the balls remains constant.

### Key points from the question:
- Two rubber balls are initially charged with equal positive charges.
- They are placed 10 cm apart.
- Violet then **triples** the charge on one of the balls while keeping the other unchanged.

### Concept Involved:
The electric force between two charges is given by **Coulomb's Law**:

\[
F = k \cdot \frac{q_1 \cdot q_2}{r^2}
\]

Where:
- \( F \) is the electric force,
- \( k \) is Coulomb’s constant,
- \( q_1 \) and \( q_2 \) are the charges on the two balls,
- \( r \) is the distance between the charges.

Initially, \( q_1 = q_2 \), and the distance between the charges, \( r \), remains constant throughout.

### When Violet triples the charge on one of the balls (say \( q_1 \)), the new charge becomes \( 3q_1 \), and the new electric force becomes:

\[
F_{\text{new}} = k \cdot \frac{(3q_1) \cdot q_2}{r^2} = 3 \cdot \left( k \cdot \frac{q_1 \cdot q_2}{r^2} \right)
\]

Thus, the electric force is **tripled**.

### Correct Answer: 
The electric force is tripled, so the correct answer is **C**.

Would you like further details or have any other questions?

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Here are five related questions to deepen understanding:
1. What happens to the electric force if both charges are doubled?
2. How does the electric force change if the distance between the charges is doubled?
3. What is the significance of Coulomb’s constant \( k \) in the formula?
4. How does the direction of the electric force change if one of the charges is negative?
5. How would the electric force change if Violet reduced the charge on one ball by half?

**Tip**: Remember, electric force varies directly with the product of the charges and inversely with the square of the distance.

How does the electric force between the balls change if the charge on one of the balls is tripled while the other remains unchanged?

Understand how the electric force between two charged objects changes when the charge on one of the objects is tripled, using Coulomb's Law. This problem involves calculating the change in force by applying electrostatic principles.

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