Van de Graaff generator is used for

Options

A. store electrical energy
B. build up high voltages of few million volts
C. decelerate charged particle like electrons
D. both (a) and (b) are correct

Answer

### Step-by-Step Solution:

1. **Understanding the Van de Graaff Generator**:
The Van de Graaff generator is an electrostatic generator that uses a moving belt to accumulate electric charge on a hollow metal globe, creating a high electric potential.

2. **Purpose of the Van de Graaff Generator**:
The primary purpose of the Van de Graaff generator is to generate high voltages, typically in the range of several million volts. This high potential is essential for various applications in physics and engineering.

3. **Acceleration of Charged Particles**:
The generator is specifically designed to accelerate charged particles, such as protons and other ions. By creating a high electric potential, it provides the necessary energy to accelerate these particles to high speeds.

4. **Applications**:
The accelerated charged particles can be used in various experiments, including collision studies in nuclear physics. This allows scientists to investigate fundamental interactions and properties of matter.

5. **Safety and Efficiency**:
The Van de Graaff generator is known for its ability to produce high voltages quickly and safely, making it a valuable tool in laboratories for research purposes.

### Conclusion:
In summary, the Van de Graaff generator is primarily used to create high voltages (in the range of millions of volts) and to accelerate charged particles for various scientific applications.

---