Assertion : Coulomb force and gravitational force follow the same inverse-square law.
Reason : Both laws are same in all aspects.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "Coulomb force and gravitational force follow the same inverse-square law."

- The Coulomb force between two point charges \( q_1 \) and \( q_2 \) is given by:
\[ F_C = k \frac{|q_1 q_2|}{r^2} \]
where \( k \) is Coulomb's constant and \( r \) is the distance between the charges.

- The gravitational force between two masses \( m_1 \) and \( m_2 \) is given by:
\[ F_G = G \frac{m_1 m_2}{r^2} \]
where \( G \) is the gravitational constant.

Both forces are inversely proportional to the square of the distance \( r \), confirming that the assertion is true.

### Step 2: Understand the Reason
The reason states that "Both laws are same in all aspects."

- While both forces follow the inverse-square law, they differ in their nature:
- The Coulomb force can be either attractive or repulsive depending on the charges (like charges repel, unlike charges attract).
- The gravitational force is always attractive, as it acts between masses.

Thus, the reason is false because the two forces are not the same in all aspects.

### Step 3: Conclusion
Based on the analysis:
- The assertion is true.
- The reason is false.

Therefore, the correct option is:
**C. Assertion is true and the reason is false.**

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