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15 Cards in this Set
- Front
- Back
Magnetic Force
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Force due to the motion of charged particles (electrons)
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Magnetic Field
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Created by a moving electric charge-the magnetic field exerts a force on the moving charge. Field lines go from positive/N to negative/S.
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Magnetic Domains
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Clusters of alligned atoms
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Electromagnet
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Created by running an electric current through a wire. The strength is increased by increasing current though the wire.
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Cosmic Rays
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The universe is a shooting gallery of charged particles. Dangerous radiation (energetic protons).
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Newtons 3rd Law
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For every action, there is an equal and opposite reaction. Ex: If a current-carrying wire produces a force on a magnet, a magnet must produce a force on a current-carrying wire.
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Magnetic Poles
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Every magnet has at least one North and South pole, they can not be isolated. Likes repel and opposites attract. No matter how many times you break a bar magnet in half, each piece will still have one N and one S pole.
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Radial
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Circular motion or concentric circles.
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Current-carrying Wire
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If it produces a force on a magnet, the magnet must produce a force on it (Newton's 3rd law). It will deflect a magnet and a magnet will deflect it. The force is strongest when the current is perpendicular to the magnetic field lines.
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Superconducting
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Produces extremely strong magnetic fields.
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Deflecting Force
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Moving charge is deflected when it moves across a magnetic field. No deflection occurs when a moving charge moves parallel to a magnetic field.
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Galvanometer
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A sensitive current-indicating instrament. Detects when a current passes through a coil.
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Electric Motor
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Modifies the design of a galvanometer slightly, so deflection makes a complete rather than partial rotation. The current is made to change direction everytime the coil makes a half rotation.
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Aurora Borealis
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"Northern Lights". Disturbances in Earth's field allow the ions to dip into the atmosphere, causing it to glow.
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Oersted
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Believes and electric current produces a magnetic field.
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