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# 'What effects the strength of an electromagnet?'

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Introduction

'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) ...read more.

Middle

When the coils will be evenly spread across the rod, the current across the rod and the magnetic field will be even. Method: The apparatus will be set up to form a circuit, as below: I will use an iron rod and make (5) coils around the rod with a piece of wire. They will be spread as evenly as possible across the rod. The ends of the wire will then be connected to the circuit with crocodile clips. The voltage on the power pack will be turned onto 0.5 amps. As this is the ampere reading from the power pack, it may not be exactly 0.5A, which is why a voltmeter has been added so the actual number of amps could be measured each time. This will also be written in the results table. When the current is switched on, I will hold the rod from one end and put the other end into a beaker full of iron filings, allowing it to pick up as many filings as possible. ...read more.

Conclusion

I will also be keeping the coils spread evenly across the whole rod, instead of in the middle/left/right, because this will allow the magnetic field strength to increase. I will keep the power pack on long enough for the rod to pick up any iron filings and so I could read the value from the voltmeter. I will find the resistance for my experiment and using this, I will work out a current value for each result and an average current too. I will weigh the mass of the iron nails picked up. This is because there are too many filings to count and they will not have the same mass so consequently I am unable to count the number of iron fillings picked up. To get an accurate value (to 2 decimal points) I will use an electronic weighing scale and the same scale each time the mass of fillings must be weighed. ...read more.

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