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A wire is wound over a pencil and placed...

A wire is wound over a pencil and placed over a scale as shown in the figure. The diameter of the given wire is `"________"`.

A

1.45cm

B

2.9mm

C

2.9m

D

1.45mm

Text Solution

Verified by Experts

The correct Answer is:
D
Number of turns =20
Distance =(4.1-1.2)cm=2.9cm
So, the diameter of the wire `=(2.9cm)/(20)=0.145 cm`
=1.45 mm
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