*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 correct answer to the question about the piezoelectric effect is:

**A: Mechanical deformation of material due to the application of a voltage.**

### Explanation:

1. **Why the correct answer is correct:**
   - The piezoelectric effect refers to the ability of certain materials (like quartz or certain ceramics) to generate an electric charge in response to applied mechanical stress. Conversely, when an electric field is applied to these materials, they can change shape or deform. This is the essence of the piezoelectric effect, making option A the correct choice.

2. **Why the other choices are incorrect:**
   - **B: Mechanical deformation of material due to the application of a magnetic field**  
     This describes the magnetostrictive effect, not the piezoelectric effect. Magnetostriction involves changes in shape or dimensions of a material in response to a magnetic field.
   
   - **C: Generation of electrical energy in the presence of light**  
     This describes the photovoltaic effect, which is the principle behind solar cells. It involves converting light energy directly into electrical energy, not mechanical deformation.
   
   - **D: Increased conductivity in the presence of light**  
     This refers to photoconductivity, where the conductivity of a material increases when exposed to light. It does not involve mechanical deformation or the piezoelectric effect.

### Useful Concepts:
- The piezoelectric effect is utilized in various applications, such as sensors, actuators, and transducers. 
- A common rule of thumb is that materials exhibiting the piezoelectric effect must lack a center of symmetry in their crystal structure.

Understanding these distinctions will help you grasp the fundamental principles of the piezoelectric effect and its applications in electronics and engineering.