Hertz experiment is used for

Options

A. Production of electromagnetic wave
B. Detection of electromagnetic wave
C. Both (1) and (2)
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding the Hertz Experiment**: The Hertz experiment was conducted by Heinrich Hertz in the late 19th century to study electromagnetic waves. It is significant because it provided experimental evidence for the existence of electromagnetic waves, which were predicted by James Clerk Maxwell's equations.

2. **Setup of the Experiment**: In the experiment, Hertz used two metal plates (let's call them P1 and P2) and two metal spheres (S1 and S2). These components were made of conductive materials like copper or zinc. The plates were connected to an inductance coil.

3. **Applying High Voltage**: A high voltage (ΔV) was applied across the plates. This high voltage ionizes the air between the plates, allowing current to flow and generating oscillating electric and magnetic fields.

4. **Production of Electromagnetic Waves**: The oscillating electric and magnetic fields create electromagnetic waves that propagate through space. This is the first key aspect of the Hertz experiment: it demonstrates the production of electromagnetic waves.

5. **Detection of Electromagnetic Waves**: To detect these waves, Hertz placed a detector (often a simple loop or another resonant circuit) at a distance from the source. When the electromagnetic waves reach the detector, they induce a current in it, confirming the presence of the waves.

6. **Conclusion**: Therefore, the Hertz experiment is used for both the production and detection of electromagnetic waves. Thus, the correct answer to the question is option 3: both production and detection of electromagnetic waves.

### Final Answer:
The correct option is 3: both production and detection of electromagnetic waves.

---