To investigate how the strength of an electromagnet change as you varies the number of turns of the coils.

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Physic coursework on electromagnet

Aim: To investigate how the strength of an electromagnet change as you varies the number of turns of the coils.

Introduction: In this experiment, we are going to design a circuit to test what factors can make the electromagnet stronger and how we can do that.

Electromagnet is a solenoid (coil of wires) with an Iron core. When an electric current flowing through a wire, it creates a magnetic field in the region of the wire. This is a way how magnetic created, which is known as electromagnetism.

Solenoid is a long coil made up of a number of turns of wire. When a current flows through solenoid each turn acts as a single coil and produces a magnetic field.

 

This diagram shows the field pattern around the solenoid.

There are some methods to increase the strength of the electromagnet, which are: -

  1. Increase the size of the current.
  2. Increase the number of turns the coil has.
  3. Use a soft iron.

Using a soft iron can increase the strength of the electromagnet, because it can turn off and on, therefore it can change easily between being magnetized and demagnetized.

The reason why increasing the number of turns of the coil will make the electromagnet stronger, because the size of the magnetic field produce by the coils will increase.

There are many advantages of using an electromagnet in many places. For example:

In many electrical devices, such as electric bell and buzzer. Electromagnet is used to switch on and off in the circuit.

Large electromagnets are used in cranes for lifting heavy iron objects.

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Prediction:

I predict that as the number of turn of coils increase, the more weight the electromagnetic can hold. This is because when you increase the turn of the coil, the electromagnetic gets stronger. As increasing the turn of the coils is one of the factors that can increase the strength of electromagnet, therefore the electromagnet can hold more weight.

Preliminary Work:

In our preliminary work, we were trying to find the best way to get the result.

First we used different kind of apparatus, therefore the results will be different.

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