প্রশ্ন: Which of the following statement holds true for the divergence of electric and magnetic flux dendities?

To determine which statements are true regarding the divergence of electric and magnetic flux densities, let's first define them in the context of Maxwell's equations:

1. **Divergence of Electric Flux Density ($\mathbf{D}$):**
  - $\nabla \cdot \mathbf{D} = \rho_v$
  - This is Gauss's law for electricity, which states that the divergence of the electric flux density ($\mathbf{D}$) is equal to the volume charge density ($\rho_v$).

2. **Divergence of Magnetic Flux Density ($\mathbf{B}$):**
  - $\nabla \cdot \mathbf{B} = 0$
  - This is Gauss's law for magnetism, which states that the divergence of the magnetic flux density ($\mathbf{B}$) is always zero. This implies that there are no magnetic monopoles, and magnetic field lines are closed loops.

Given these definitions, the following statements are true:

- **The divergence of electric flux density is equal to the volume charge density** ($\rho_v$).
- **The divergence of magnetic flux density is always zero.**

If you have specific statements in mind, feel free to share them, and I can help evaluate their correctness based on the above principles.