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Electric and Magnetic Forces in Everyday Life In this presentation you will: identify electric and magnetic forces in everyday life Monday, April 8, 13 Next > Introduction Many devices used in everyday life rely on electric and magnetic forces to operate. Next > Monday, April 8, 13 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. Next > Monday, April 8, 13 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. Monday, April 8, 13 Next > Magnetic Force Examples There is a natural magnetic field surrounding us all the time; the Earth’s magnetic field. 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. Next > Monday, April 8, 13 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. Next > Monday, April 8, 13 Magnetic Force Examples More complex applications include: televisions, radios, microwave ovens, telephone systems, and computers. Computer hard drives use magnetism to store the data on a rotating disk. Next > Monday, April 8, 13 Magnetic Force Examples An industrial application of magnetic force is an electromagnetic crane that is used for lifting metal objects. Next > Monday, April 8, 13 Magnetic Force Examples There are applications of magnetic force in medical science. X-ray and scanning devices rely on electromagnetic action. MRI scanners are Magnetic Resonance Imaging devices, and they are used in hospitals to create 3D images of body parts. Next > Monday, April 8, 13 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. Next > Monday, April 8, 13 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. Next > Monday, April 8, 13 Question 1 Would the abrasive paper manufacturing process work if both the paper and the particles were positively charged? Answer Yes or No. Next > Monday, April 8, 13 Question 1 Would the abrasive paper manufacturing process work if both the paper and the particles were positively charged? Answer Yes or No. No Next > Monday, April 8, 13 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 Next > Monday, April 8, 13 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 Next > Monday, April 8, 13 Summary In this presentation you have seen: examples of electric and magnetic forces in everyday life End > Monday, April 8, 13