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Question

A uniform wire of diameter 0.8 mm is wound on a scale in turns such that it covers a distance of 8 divisions. The scale taken has each cm being calibrated to 10 divisions. Find the number of turns wound.

A
9
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B
18
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C
20`
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D
10
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Solution

The correct option is D 10
1 cm=10 division
1 division = 0.1 cm or 1 mm

Diameter of a wire = 0.8 mm
Distance covered by wire on the scale = 8 divisions
= 8 × 1mm = 8 mm

No. of turns wound =Distance coveredDiameter
=8mm0.8mm

=10turns

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