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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

2.9cm

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= 2.9 cm
So, the diameter of the wire `=(2.9cm)/(20)= 0.145 cm =1.45mm`
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