*Question E6D03:
Which of the following is an aspect of the piezoelectric effect?*  

*Correct Answer is  A: Mechanical deformation of material due to the application of a voltage*  

### AI Response: (may contain errors)  

The piezoelectric effect is a property of certain materials that allows them to convert mechanical energy into electrical energy and vice versa. Here's a breakdown of the choices:

1. **Correct Answer: A - Mechanical deformation of material due to the application of a voltage**

   - The piezoelectric effect involves the generation of an electric charge in response to mechanical stress. Conversely, when a voltage is applied to a piezoelectric material, it undergoes mechanical deformation. This is the direct piezoelectric effect and is used in various applications like sensors and actuators.

2. **Why the other choices are incorrect:**

   - **B: Mechanical deformation of material due to the application of a magnetic field**
     - This describes magnetostriction, not the piezoelectric effect. Magnetostriction is the change in shape or dimensions of a ferromagnetic material when subjected to a magnetic field.

   - **C: Generation of electrical energy in the presence of light**
     - This describes the photovoltaic effect, which is the basis for solar cells. It is not related to the piezoelectric effect.

   - **D: Increased conductivity in the presence of light**
     - This describes photoconductivity, where a material becomes more conductive due to the absorption of light. Again, this is unrelated to the piezoelectric effect.

In summary, the piezoelectric effect specifically involves the interaction between mechanical stress and electrical charge in certain materials, and the correct answer reflects this relationship.