Factors that Affect the Strength of the Electromagnet

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Factors that Affect the Strength of the Electromagnet 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 Nails

· Voltmeter

· Plastic Beakers

· Electronic Balance

Hypothesis:

I expect the strongest electromagnet to have a 'soft' iron core; the

highest number of coils (45); the strongest voltage (10V) and current

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 be

turned on and off. From a previous experiment, using an electromagnet,

I found out that the iron rod picked up many nails when turned on and

dropped them all when switched off but the steel rod picked few nails

up when switched on, yet held on to them even after the current was

switched off. For this experiment, the iron rod is needed. A high

number of coils provides a stronger solenoid. When current flows

through the wires it create a magnetic field, therefore with more

coils a stronger magnetic field and therefore a stronger electromagnet

would be created. A stronger magnetic field will also be created if

the size of the voltage increases, the higher the voltage means the

size of current will increase too. The stronger the magnetic field,

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