PHY 2049: Physics II

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PHY 2049 Physics II

• Exam II is scheduled for Wednesday June 18, in
  class.
• Ch. 26 Current and resistance
• Ch. 27 Circuits
• Ch. 28 Magnetic Field Effects
• Ch. 29 Field from currents.

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PHY 2049 Physics II, HITT

• The diagram shows a straight wire carrying
  current i in a uniform magnetic field. The
  magnetic force on the wire is indicated by an
  arrow but the magnetic field is not shown. Of the
  following possibilities, the direction of the
  magnetic field is

A. opposite the direction of the current B.
opposite the direction of F C. in the direction
of F D. into the page E. out of the page
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PHY 2049 Physics II, HITT

• The diagram shows a straight wire carrying
  current i in a uniform magnetic field. The
  magnetic force on the wire is indicated by an
  arrow but the magnetic field is not shown. Of the
  following possibilities, the direction of the
  magnetic field is

A. opposite the direction of the current B.
opposite the direction of F C. in the direction
of F D. into the page E. out of the page
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PHY 2049 Physics II
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A different problem

• Electrons (mass m, charge -e) are accelerated
  from rest through a potential difference V and
  are then deflected by a magnetic field B that is
  perpendicular to their velocity. The radius of
  the resulting electron trajectory is
• A. v(2eV/m)/ B B. Bv(2eV) /m C. v(2mV/e)/B
• D. Bv2mV /e E. none of these