Assertion: For a point charge concentric spheres centered at a location of the charge are equipotential surfaces.
Reason : An equipotential surface is a surface over which potential has zero value.

Options

A. If both assertion and reason are ture and reason is the correct explanation of assertion.
B. If both assertin and reason are ture 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 both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that for a point charge, concentric spheres centered at the location of the charge are equipotential surfaces.

- **Explanation**: A point charge creates an electric field that radiates outward uniformly in all directions. The potential \( V \) at a distance \( r \) from a point charge \( Q \) is given by the formula:
\[ V = \frac{kQ}{r} \]
where \( k \) is Coulomb's constant. For any sphere centered at the charge, every point on the surface of the sphere is at the same distance \( r \) from the charge. Therefore, the potential \( V \) is constant across the surface of the sphere.

### Step 2: Understand the Reason
The reason states that an equipotential surface is a surface over which the potential has zero value.

- **Explanation**: This statement is misleading. An equipotential surface does not necessarily have to have a potential value of zero; rather, it means that the potential is constant across the surface. For example, the potential can be a non-zero constant value. Therefore, the reason provided is incorrect.

### Step 3: Conclusion
- The assertion is **true** because concentric spheres around a point charge are indeed equipotential surfaces as they maintain the same potential at all points on the surface.
- The reason is **false** because it incorrectly defines equipotential surfaces as having zero potential, rather than constant potential.

### Final Answer
- The assertion is true, but the reason is false. Therefore, the correct conclusion is that the assertion is true, but the reason does not correctly explain the assertion.

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