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Clinical Thermometer

A uniform wir...

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
$1 c m = 10 d i v i s i o n$
$\Rightarrow$ 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 $\times$ 1mm $=$ 8 mm

No. of turns wound $= \frac{D i s t a n c e c o v e r e d}{D i a m e t e r}$
$= \frac{8 m m}{0.8 m m}$

$= 10 t u r n s$

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