'What effects the strength of an electromagnet?'

The first 200 words of this essay...

'What effects the strength of an electromagnet?'

Introduction:

An electric current flowing through a wire produces a magnetic field. Coiling the wire produces a stronger magnetic field. Coiling it around a soft iron core increases the strength effect; raising the current or the number of coils increases it further.

I am going to investigate the raising of the current and how it affects an electromagnet.

I think the electromagnet will produce a stronger magnetic filed and pick up more iron fillings.

Aim:

To investigate factors which affect the strength of the electromagnet and make the strongest electromagnet possible.

Apparatus:

· Iron Rod

· Leads

· Power Pack

· Crocodile Clips

· Insulated Wire

· Iron Filings

· Voltmeter

· Plastic Beakers

· Electronic Balance

Hypothesis:

I expect the strongest electromagnet to have a 'soft' iron core; the number of coils being (45) the current varies, the strongest amps being (7.00A) and have the coils evenly spread across the iron rod.

The 'soft' iron core means it changes easily between being magnetised and de-magnetised, it is perfect for electromagnets, which need to