Assertion Magnetic flux and the electric flux have the same units.
Reason Flux passing throught a surface gives an idea about the field lines crossing that surface

Options

A. If both Assertion and Reason are corrent and Reason is the corrent explanation of Assertion.
B. If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If Assertion is false but Reason is ture.

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 "Magnetic flux and electric flux have the same units."

- **Electric Flux (Φ_E)** is defined as the product of the electric field (E) and the area (A) through which it passes, mathematically expressed as:
\[ Φ_E = \vec{E} \cdot \vec{A} \]
The unit of electric flux is volt-meter (V·m) or equivalently, newton-meter squared per coulomb (N·m²/C).

- **Magnetic Flux (Φ_B)** is defined similarly as the product of the magnetic field (B) and the area (A) through which it passes:
\[ Φ_B = \vec{B} \cdot \vec{A} \]
The unit of magnetic flux is weber (Wb), which can also be expressed as tesla-meter squared (T·m²).

### Step 2: Compare Units
Now, we compare the units of electric flux and magnetic flux:

- Electric Flux: V·m or N·m²/C
- Magnetic Flux: Wb or T·m²

Since the units of electric flux and magnetic flux are different, the assertion is **false**.

### Step 3: Understand the Reason
The reason states that "Flux passing through a surface gives an idea about the field lines crossing that surface."

This statement is indeed correct. Both electric flux and magnetic flux represent the number of field lines passing through a given area. Thus, the reason is **true**.

### Step 4: Conclusion
Based on our analysis:
- The assertion is false.
- The reason is true.

Thus, the correct answer is that the assertion is false, but the reason is true.

### Final Answer
The assertion is false, and the reason is true.