Question

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.

Answer 1

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.