Download PHY 2049: Physics II

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.
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
A. opposite the direction of
arrow but the magnetic
the current
field is not shown. Of the B. opposite the direction of F
following possibilities, the C. in the direction of F
D. into the page
direction of the magnetic E. out of the page
field is:
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
A. opposite the direction of
arrow but the magnetic
the current
field is not shown. Of the B. opposite the direction of F
following possibilities, the C. in the direction of F
D. into the page
direction of the magnetic E. out of the page
field is:
PHY 2049: Physics II
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. √(2eV/m)/ B B. B√(2eV) /m C. √(2mV/e)/B
D. B√2mV /e
E. none of these