Why might a current-carrying wire be placed between a magnetic field?
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  • To increase the current from the interaction of magnetic fields
  • To increase the voltage from the interaction of magnetic fields
  • To produce a force from the interaction of magnetic fields
What direction is the force/motion in the following diagram?
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  • Perpendicular to the magnets
  • Downwards
  • Parallel and through the magnets
What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?
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  • 180
  • 45
  • 90
  • 270
Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?
  • Gravity
  • Magnetic flux density/size of magnetic field
  • Size of the current
  • Length of the conductor
A 20 cm section of wire with a current of 8 A is at 90 degrees to a 0.1 T magnetic field. What direction is the force and calculate the size of it? F = BIlF\ =\ BIlF = BIl  
  • up, 0.1 x 8 A x 20 cm = 16 N
  • down, 0.1 x 8 A x 20 cm = 16 N
  • down, 0.1 x 8 A x 0.20 m = 0.16 N
  • up, 0.1 x 8 A x 0.20 m = 0.16 N
Name the effect that causes a coil of current-carrying wire in an electric motor to move.
  • The electromagnetism effect
  • The magnetic effect
  • The motor effect
Which rule can be used to work out which way a coil of wire rotates in a motor?
  • Fleming's left-hand rule
  • Fleming's right-hand rule
How does a split ring commutator work?
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  • Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
  • Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.
  • Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.
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