Physical Science; Module 8
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A magnetic field best changes the direction of a beam of electrons when the beam and the field
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are at right angles to each other.
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A generator converts
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mechanical energy to electrical energy.
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A magnetic force acting on a moving electron can change its
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direction.
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Faraday's law is the law
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of electromagnetic induction.
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Which force field can increase the speed of a moving electron?
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Electric only.
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Magnetic domains occur mainly for materials composed of
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iron
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A magnetic force acts on an electron only when the electron
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moves parallel to magnetic field lines.
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Consider a long bar magnet with two poles, one pole at each end. If the bar is broken into three pieces there will be a total of
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six poles.
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A magnetic force on an electron cannot change its
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speed NOR its kinetic energy.
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When the direction of a magnetic field inducing voltage alternates, the current produced is
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ac
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A magnetic force acting on a beam of electrons can change
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only the direction of the beam.
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A strong magnet lifts a paper clip. Compared with the force the magnet exerts on the clip, the force the clip exerts on the magnet is
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the same.
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The magnetic domains in a magnet produce a stronger magnet when the domains are
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aligned
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In the space around a magnet is
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an electric field.
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Electromagnetic induction is utilized in
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all of the above; the reading of credit and ATM cards, many airport security devices, coils beneath pavements that trigger traffic-light changes.
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The force that a magnetic field exerts on moving charged particles
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all of the above; increases with their speed, is fundamentally different compared with the direction of electric forces, cannot change their speed.
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Earth's magnetic field deflects
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cosmic radiation.
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A motor and a generator are
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similar devices.
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Outside a magnet, magnetic field lines are conventionally drawn from
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north to south pole.
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Surrounding moving electric charges are
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both electric and magnetic fields.
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The source of all magnetism is
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spinning and orbiting electrons.
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A changing electric field can induce a changing
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magnetic field.
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A generator is
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a motor in reverse.
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A bar magnet that holds a chain of paper clips illustrates
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magnetic field displacement.
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The essential concept in an electric generator is
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Faraday's Law.
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An electric field is induced in any region of space in which
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a magnetic field changes with time.
