What is the relation between voltage sensitivity Sₕ and the current sensitivity S of a moving coil galvanometer? (Given that G is the resistance of the galvanometer.)

• Sₕ = G S₁
• Sₕ = S₁ / G
• Sₕ = G
• Sₕ = G₂

The relationship between voltage sensitivity (Sₕ) and current sensitivity (S) in a moving coil galvanometer is an important concept in understanding how these devices operate. The sensitivities are related through the resistance of the galvanometer (G).

Key Relationships

In a moving coil galvanometer, the following equations illustrate the connection:

• Sₕ = G × S: This equation shows that voltage sensitivity is directly proportional to the resistance of the galvanometer and the current sensitivity.
• Sₕ = S / G: This alternative form indicates that voltage sensitivity can also be expressed as the current sensitivity divided by the resistance.

Understanding the Terms

Voltage Sensitivity (Sₕ) refers to how much the galvanometer deflects per unit of voltage applied. Current Sensitivity (S) indicates the deflection per unit of current flowing through the device.

Practical Implications

When designing or using a galvanometer, knowing how to manipulate these sensitivities can help in achieving desired measurements. For instance, increasing the resistance (G) can enhance voltage sensitivity while affecting current sensitivity.

In summary, the relationship between voltage sensitivity and current sensitivity in a moving coil galvanometer is defined by the resistance, allowing for flexibility in measurement techniques.