identify electric and magnetic forces in everyday life

Electric and Magnetic Forces in Everyday Life

In this presentation you will:

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Monday, April 8, 13

Many devices used in everyday life rely on electric and magnetic forces to operate.

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Introduction

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Electric Force Examples

Some examples of electric force include: Abrasive paper manufacturing

– the positively charged particles used to smooth rough surfaces are attracted to a negatively charged adhesive paper.

Electroplating and anodizing – metals coated with an oxide layer for protection by way of an attractive force caused by electrical current flow.

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Electric Force Examples

Powder coating – a coating of charged powder particles are attracted to an oppositely charged object.

Party trick – ‘sticky balloon’. Rubbing a balloon against your hair will create enough static charge to make the balloon ‘stick’ to a wall.

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Magnetic Force Examples

A compass detects the Earth’s magnetic field. A needle is moved by the magnetic force, so that one end points north and the other end points south.

There is a natural magnetic field surrounding us all the time; the Earth’s magnetic field.

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Magnetic Force Examples

There are numerous applications of electric and magnetic forces.

A door catch is a simple device that uses the magnetic force of attraction to hold a door closed.

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Magnetic Force Examples

Computer hard drives use magnetism to store the data on a rotating disk.

More complex applications include: televisions, radios, microwave ovens, telephone systems, and computers.

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Magnetic Force Examples

An industrial application of magnetic force is an electromagnetic crane that is used for lifting metal objects.

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Magnetic Force Examples

MRI scanners are Magnetic Resonance Imaging devices, and they are used in hospitals to create 3D images of body parts.

There are applications of magnetic force in medical science. X-ray and scanning devices rely on electromagnetic action.

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Magnetic Force Examples

Electric motors use the electromagnetic force between a magnet and a current carrying coil to produce movement.

Electric generators use the electromagnetic force between a magnet and a moving coil to generate electrical energy.

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Magnetic Force Examples

Loudspeakers use an electric current flowing through a coil to generate a magnetic field. This field interacts with the field of a permanent magnet to make a diaphragm move and produce sound.

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Question 1

Would the abrasive paper manufacturing process work if both the paper and the particles were positively charged?

Answer Yes or No.

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No

Question 1

Would the abrasive paper manufacturing process work if both the paper and the particles were positively charged?

Answer Yes or No.

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Question 2

What creates a mechanical turning force in an electric motor?

A) A single magnetic field

B) Two magnetic fields

C) Microwaves, generated by an electro-magnetic device

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Monday, April 8, 13

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What creates a mechanical turning force in an electric motor?

A) A single magnetic field

B) Two magnetic fields

C) Microwaves, generated by an electro-magnetic device

Question 2

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examples of electric and magnetic forces in everyday life

In this presentation you have seen:

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Summary

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