It is observed in case of stringed instruments sometimes that a thick wire is wrapped by a thin wire. Give reason behind this practice.

Explanation

### Step-by-Step Solution:

1. **Understanding Stringed Instruments**:
- Stringed instruments like guitars and sitars produce sound by vibrating strings. The vibration of the strings is what generates the sound we hear.

2. **Fixed Ends and Modes of Vibration**:
- The strings are fixed at both ends, and when they vibrate, they can do so in different modes (n modes). The fundamental frequency and harmonics depend on the length of the string and its physical properties.

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