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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

3.73 cm

B

3.67 cm

C

3.38 cm

D

3.32 cm

Text Solution

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The correct Answer is:
c
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