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15 Cards in this Set

  • Front
  • Back
Magnetic Force
Force due to the motion of charged particles (electrons)
Magnetic Field
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.
Magnetic Domains
Clusters of alligned atoms
Electromagnet
Created by running an electric current through a wire. The strength is increased by increasing current though the wire.
Cosmic Rays
The universe is a shooting gallery of charged particles. Dangerous radiation (energetic protons).
Newtons 3rd Law
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.
Magnetic Poles
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.
Radial
Circular motion or concentric circles.
Current-carrying Wire
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.
Superconducting
Produces extremely strong magnetic fields.
Deflecting Force
Moving charge is deflected when it moves across a magnetic field. No deflection occurs when a moving charge moves parallel to a magnetic field.
Galvanometer
A sensitive current-indicating instrament. Detects when a current passes through a coil.
Electric Motor
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.
Aurora Borealis
"Northern Lights". Disturbances in Earth's field allow the ions to dip into the atmosphere, causing it to glow.
Oersted
Believes and electric current produces a magnetic field.
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