investigating factors that affect the strength of an electromagnet

Investigating Factors that Affect the Strength of an Electromagnet

Aim:

To investigate the factors, which affect the strength of an electromagnet, also known as it's, pick up power.

Predictions:

The more coils of wire used on the electromagnet then the greater number of paper clips picked up. Also The greater the current the greater the number of paper clips picked up. There will also be a limit to the amount of magnetism created and how many paper clips can be picked up, known as saturation. For the number of coils I believe that the more coils the more paper clips picked up. This is because the magnetism cuts through more coils, which induces a bigger current.
For the length of wire I believe the longer the wire the more paper clips picked up. This is because there is a bigger surface area so the magnetism cuts through more coils, which induces a bigger current. For the current variable I believe that the greater the current, the more paper clips picked up. This is because the magnetism has a greater field to cut through so it induces more electricity.

Plan:

We are going to make a circuit, including a coil around a core, and measure how the variables affect the number of paper clips picked up.
These variables are length of wire, number of coils, and the strength of the current.

Method:

We are going to use a circuit that includes a 12v power pack on a d.c and a.c current, a variable resistor set at different currents, an ammeter, crocodile connecting clips, an iron core, a wire coil, paper clips and a light bulb which provides resistance when we are using just a few turns on a coil. We shall vary the length of the wire by changing it for different lengths but keeping the amount of coils and voltage the same. We will vary the amount of coils by adding them or removing them keeping the same length wire and voltage. We will vary the amount of volts using the variable resistor, but still