Area of the cross-section of a wire is measured using a screw gauge. The pitch of the main scale is $0.5 \text{ mm}$. The circular scale has $100$ divisions and for one full rotation of the circular scale, the main scale shifts by two divisions. The measured readings are listed below.
Measurement conditionMain scale readingCircular scale reading
Two arms of gauge touching each other without wire$0$ division$4$ division
Attempt-$1$: With wire$4$ division$20$ division
Attempt-$2$: With wire$4$ division$16$ division

What are the diameter and cross-sectional area of the wire measured using the screw gauge?

  • A
    $2.22 \pm 0.02 \text{ mm}, \pi(1.23 \pm 0.02) \text{ mm}^2$
  • B
    $2.22 \pm 0.01 \text{ mm}, \pi(1.23 \pm 0.01) \text{ mm}^2$
  • C
    $2.14 \pm 0.02 \text{ mm}, \pi(1.14 \pm 0.02) \text{ mm}^2$
  • D
    $2.14 \pm 0.01 \text{ mm}, \pi(1.14 \pm 0.01) \text{ mm}^2$

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If the screw on a screw gauge is given six rotations,it moves by $3\; mm$ on the main scale. If there are $50$ divisions on the circular scale,the least count of the screw gauge is:

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