Understanding Magnetic Force

A beam of positively charged alpha particles enters

the magnetic field between the poles of a magnet.

In which direction is the magnetic force on the beam?

• Down the page

• Into the page

• Out of the page

• Up the page

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An electron which moves with a speed of 30000

𝑚/𝑠 parallel to a uniform magnetic field of 0.40 𝑇

experiences a force of what magnitude?

• 0

• 2.2 E -24

• 1.9 E -15

• 4.8 E -14

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The force on a charged particle created by its

motion in a magnetic field is maximum at what angle

between the particle velocity and field?

• 0

• 45

• 90

• 180

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The diagram shows a beam of electrons entering a

magnetic field. What is the effect of the magnetic field on the electrons?

• They are deflected into the plane of the

  diagram

• They are deflected out of the plane of the

  diagram

• They are deflected towards the bottom of

  the diagram

• They are deflected towards the top of the

  diagram.

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Three particles travel through a region of space

where the magnetic field is out of the page, as shown

in the figure. The electric charge of each of the three

particles is, respectively.

• 1 is neutral, 2 is negative, and 3 is

  positive

• 1 is neutral, 2 is positive, and 3 is

  negative

• 1 is positive, 2 is negative, and 3 is

  neutral

• 1 is negative, 2 is neutral, and 3 is

  positive

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How does a split ring commutator work?

• Swaps the contact every 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 every 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 every 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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A current carrying wire lies between the poles of

two magnets, as shown. What is the direction of the force on the wire?

• Into the plane of the paper

• Out of the plane of the paper

• Towards the N-pole

• To the right

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What is the magnetic force exerted on a 3.50 𝑚 length of wire carrying a current of 1.20 𝐴 perpendicular to a

magnetic field of 0.890 𝑇?

• 6.5 N

• 4.25 N

• 3.74 N

• 1.75 N

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Which of the following has no effect on the size of the turning effect on the coil of an electric motor?

• the size of the current in the coil
  
• the direction of the current in the coil
  
• the number of turns in the coil
  
• the strength of the magnetic field