Test whether changing a certain variable in an electromagnet circuit (either the coils around the core or the current- the flow of electricity around the circuit has any affect on the strength of the electromagnet which is tested by its magnetic strength.

Charlotte Swain                                                                                                                       Physics Homework

Aim

The aim of the experiment is to test whether changing a certain variable in an electromagnet circuit (either the coils around the core or the current- the flow of electricity around the circuit has any affect on the strength of the electromagnet which is tested by its magnetic strength.

Prediction and Hypothesis

This prediction is going to be based on two different variables, one is changing the number of coils around the core of the electromagnet and the other is altering the current (flow of electricity) around the circuit on the power pack.

The prediction is that when the number of coils is altered whether it is more or less; the strength of the electromagnet will be changed whether it is stronger or weaker.  When a wire is coiled and wrapped around a core (iron nail) it makes the electromagnet stronger than it would be just having a straight wire. The coils act as a resistor making the electric current take a longer time to pass through then consequently they concentrate the flow of electricity that passes through the wire. Whenever there is a an electric current passing through a wire a magnetic field is always present around it, by coiling the wire around a core such as an iron nail the magnetic field around it is more concentrated. This has the power to align the microscopic domains in the nail, in the direction of the field to make it magnetic and have clear north and south poles. The more domains that are aligned the greater the strength of the magnet, and the larger amount of paperclips it will pick up. So the more coils there are, the more concentration of the magnetic field and obviously the more domains aligned so the stronger the magnet. It works both ways with when you say the less coils etc.

The other variable is the current (controlling the amount of electricity which passes through the circuit.) The prediction is that when the current is increased the electromagnet will be stronger and when it is decreased it will be weaker. This hypothesis comes from the same logic as what happens when the amount of coils is altered. If more current is flowing through the circuit it will increase the size of the magnetic field or the amount of concentration of electricity, when the current passes through the coils; therefore increasing the amount of domains in the core which become aligned and ...