Magnetic Force

Problems

practice

  1. Write something.
  2. Write something.
  3. Write something.
  4. Write something completely different.

conceptual

  1. How does the direction of a magnetic force on a moving charged particle differ from the direction of an electric force? State the direction of each force relative to the respective field.
  2. Describe the path of a charged particle in a uniform magnetic field if its velocity is …
    1. parallel to the magnetic field,
    2. perpendicular to the magnetic field, and
    3. at an angle to the magnetic field that is neither parallel nor perpendicular.
  3. This is a hypothetical experiment that you can try at home. Take a strong magnet and hold it up to the screen of a CRT television set.
    1. Why does the image become distorted?
    2. Why is the image covered with colored bands of red, green, and blue?
    3. Why does the color stay screwed up after the magnet is removed?
    4. Why does the color return to normal after the television has been turned off and back on?
    5. Why doesn't this effect occur with plasma and LCD displays?
  4. Show the direction of the force acting on the current-carrying wire between the two bar magnets.
     
     
  5. Show the direction of the force acting on the electron moving between the poles of a horseshoe magnet.
     
     
  6. The tracks highlighted in the photograph on the right were made by subatomic particles in a collider. The tracks highlighted in red and green were made by electrons.
    1. How are the tracks made by the electrons different from the other tracks? Why are they different?
    2. How is the track highlighted in red different from the track highlighted in green? Why is it different?
  7. A positively charged particle is placed at rest in a region of uniform electric and magnetic fields. Describe …
    1. the direction of the electric and magnetic forces just as soon the particle gets moving and
    2. the resulting path of the charge

    if the two fields are …

       
    1. parallel
    		  
    1. antiparallel
    		  
    1. perpendicular

algebraic

  1. Three problems about electromagnetic units …
    1. Show that the form used on most reference tables for the permeability of free space (μ0 = 4π × 10−7 Tm/A) is equivalent to the form derived in the discussion above (μ0 = 4π × 10−7 N/A2).
    2. Express the permeability of free space in terms of funamental units.
    3. Reduce the tesla to its equivalent in fundamental units.

The Physics Hypertextbook

  • No condition is permanent.