Electromagnet

HYPOTHESIS:
The more number of loops on the iron, the more paper clips it has.

QUESTION:
Does the number of loops of copper wire affect the strength of the magnet?

MATERIALS:
Wire (2meters)
Battery (1)  
Paper clips (1 box)
Iron

Materials for making the electromagnet.

Number of loops

20
40
60
77

Number of paper clips

3 
16
31
39

When there are 20 loops on the iron, there are 3 paper clips stick to it.

When there are 40 loops on the iron, there are 16 paper clips stick to it.

When there are 60 loops on the iron, there are 31 paper clips stick to it.

When there are 77 loops on the iron, there are 39 paper clips stick to it.