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Two full turns of the circular scale of...

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale . The total number of divisions on the circular scale is 50. Further more it is found that the screw gauge has a zero error of - 0.02 mm . While measuring the diameter of a thin wire , a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 37. The diameter of the wire is

A

4.37 mm

B

4.39 mm

C

4.74 mm

D

4.76 mm

Text Solution

Verified by Experts

The correct Answer is:
b
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