quiz - p6

• Opposite poles attract each other
• like poles repel each other
• This deviation, which varies with location, is called magnetic declination or magnetic variation.
• the magnetic field is not horizontal at most points on the

  earth’s surface
• A magnetic field is angle up or down and is called magnetic inclination.
• If a bar magnet is broken in two, each broken end becomes a pole.
• A magnetic field is defined by the force that a charged particle experiences moving in this field, after we account for the gravitational and any additional electric forces possible on the charge.
• The magnitude of this force is proportional to the amount of charge q, the speed of the charged particle v, and the magnitude of the applied magnetic field.
• The direction of this force is perpendicular to both the direction of the

  moving charged particle and the direction of the applied magnetic field.
• F = qvB
• F = qvB sin θ
• θ is the angle between the velocity and the magnetic field.
• The SI unit for magnetic field strength B is called the tesla (T)
• 1

  A) Magnetic Field Lines of a Bar Magnet

  
• 2

  A) Magnetic Field Lines between unlike poles

  
• 3

  A) Magnetic Field Lines between like poles

  
• The direction of the magnetic field is tangent to the field line at any point in space. A small compass will point in the direction of the field line.
• The strength of the field is proportional to the closeness of the lines. It is

  exactly proportional to the number of lines per unit area perpendicular to the lines (called the areal density).
• Magnetic field lines can never cross, meaning that the field is unique at

  any point in space.
• Magnetic field lines are continuous, forming closed loops without a

  beginning or end. They are directed from the north pole to the south pole.
• 4

  A) 1N

  B) A . m

  
• 5

  A) 1G

  B) 10^-4

  
• F = 0

  
• F = qvBsinθ

  
• F = qvb

  
• q = 1.6 x 10^-19 C
• B = F/qv
• 6

  A) r

  B) mv

  C) qB

  
• centripetal force formula

  A) Fc

  B) mv^2

  C) r

  
• r is the radius of curvature of the path of a charged particle with mass m and charge q, moving at a speed v that is perpendicular to a magnetic field of strength B.
• the time for the charged particle t go around the circular path is defined as the period, which is the same as the distance traveled (circumference) divided by the speed.
• A current-carrying wire generates a magnetic field and the magnetic field exerts a force on the current-carrying wire.
• thumb points in the direction of the current
• fingers wrap around the wire, pointing in the direction of the magnetic field produced.
• 7

  A) B

  B) CURRENT

  C) MAGNETIC FIELD

  D) FORCE