Elastic Moduli

To determine the diameter of the wire, we need to understand the readings given by the screw gauge:

The screw gauge uses two scales: the main scale and the circular scale.

The given data is:

• Main scale reading:
• Circular scale reading: divisions

According to the question, on the main scale corresponds to divisions on the circular scale. Therefore, each division on the circular scale corresponds to:

Given the circular scale reading is divisions, the value it represents in millimeters is:

Since the main scale reading is , the total reading (which is the diameter of the wire) is solely due to the circular scale:

Converting to centimeters (since the options are in cm):

Therefore, the diameter of the wire is .

Thus, the correct answer is 0.052 cm.