Question

The sensitivity of a milliammeter of range 0 to 50 mA is \( \frac{x}{\text{div}} \, \text{mA} \). If it is converted into an ammeter of range 500 mA by using a suitable shunt then the sensitivity will be:

• A. \( \frac{x}{20} \, \text{div/mA} \)
• B. \( \frac{x}{5} \, \text{div/mA} \)
• C. \( \frac{x}{15} \, \text{div/mA} \)
• D. \( \frac{x}{10} \, \text{div/mA} \)

Hint:

When converting a meter to a different range using a shunt, the sensitivity decreases in proportion to the increase in range.

Answer 1

The Correct Option is D

Step 1: Sensitivity of Ammeter.
The sensitivity of a meter is inversely proportional to the range. The original meter has a range of 50 mA, and after conversion, the range becomes 500 mA. The sensitivity will decrease by a factor of \( \frac{500}{50} = 10 \). Thus, the new sensitivity will be: \[ \frac{x}{10} \, \text{div/mA} \] Step 2: Final Answer.
Thus, the sensitivity of the new ammeter will be \( \frac{x}{10} \, \text{div/mA} \).