The Motor Effect and Electric Motors

Why might a current-carrying wire be placed between a magnetic field?

• 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

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What does the thumb indicate in flemings left hand rule?

• Force

• Motion

• Current

• Magnetic field direction

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What direction is the force/motion in the following diagram?

• Perpendicular to the magnets

• Downwards

• Parallel and through the magnets

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What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

• 180

• 45

• 90

• 270

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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

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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? $F\ =\ BIl$  

• 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

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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

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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

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Give two ways you can reverse the direction of a basic dc motor?

• Reverse the current

• Keep the current the same

• Reverse the magnetic field

• Keep the magnetic field the same

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How does a split ring commutator work?

• 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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