A : The field in a cavity inside a conductor is zero which causes electrosatic shielding.
R : Dielectric constant of conducotrs in electrostatics is infinite.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4).

Answer

To solve the given question, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Understanding the Assertion (A)
The assertion states that "The field in a cavity inside a conductor is zero which causes electrostatic shielding."

- In electrostatics, when a conductor is in electrostatic equilibrium, the electric field inside the conductor is zero.
- If there is a cavity within the conductor, the charges on the conductor redistribute themselves in such a way that the electric field inside the cavity is also zero.
- This phenomenon is known as electrostatic shielding, where external electric fields do not penetrate into the cavity.

### Step 2: Analyzing the Reason (R)
The reason states that "Dielectric constant of conductors in electrostatics is infinite."

- The dielectric constant (k) is defined as the ratio of the electric field in a vacuum to the electric field in a material.
- For conductors, the electric field inside is zero when they are in electrostatic equilibrium.
- If we consider the formula for the electric field in a medium, \( E = \frac{Q}{4\pi \epsilon_0 k r^2} \), and set \( E = 0 \) for a conductor, we can deduce that \( k \) must approach infinity to satisfy the equation since we cannot have a zero denominator.

### Step 3: Conclusion
- Both the assertion and the reason are correct.
- However, the reason provided does not directly explain the assertion. The assertion is based on the properties of conductors in electrostatic equilibrium, while the reason discusses the dielectric constant, which is a separate concept.

### Final Answer
- The correct answer is: **Option B**: Statement 1 is correct, Statement 2 is correct, but Statement 2 is not the correct explanation of Statement 1.