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35 votes
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.

User Jonas Zaugg
by
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1 Answer

21 votes
21 votes

Answer:

1. 2.5 mm

2. 0.25 cm

Step-by-step explanation:

Since the length of the 10 turns of the wire around the pencil is 25 mm, then;

1. the thickness of the wire =
(length of total turns)/(number of turns)

=
(25)/(10)

= 2.5 mm

The thickness of the wire is 2.5 mm.

2. Since 10 mm = 1 cm, then;

25 mm = 2.5 cm

So that,

the thickness of the wire in centimetre =
(length of total turns)/(number of turns)

=
(2.5)/(10)

= 0.25 cm

The thickness of the wire is 0.25 cm.

User Mansiemans
by
2.7k points