PHY 232 - Exam 3 2026 Questions and
Answers
A compass can be used to trace field lines (T/F) - Correct answer-True
The lines outside the magnet point from the South pole to the North pole (T/F) -
Correct answer-False, they point North to South
F = qv X B - Correct answer-Force on a charge moving in a magnetic field
Dot signifies a B field.... - Correct answer-out of page
x signifies a B field - Correct answer-into page
When a charged particle moves with a given velocity through a magnetic field, the
field can alter the direction of the velocity (T/F) - Correct answer-True
When a charged particle moves with a given velocity through a magnetic field, the
field can alter the speed and kinetic energy (T/F) - Correct answer-False, the
kinetic energy cannot be altered by the magnetic field alone
A magnetic force causes centripetal acceleration, changing the direction of the
velocity of a particle (T/F) - Correct answer-True
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, F = qvB = (mv^2)/r - Correct answer-Centripetal force in a magnetic field
w = v/r = (qB)/m - Correct answer-Angular speed (cyclotron frequency)
T = (2pir)/v = 2pi/w = (2pim)/qb - Correct answer-Period of motion
In a uniform B field, a charged particle moves in a helical path with respect to the
field (T/F) - Correct answer-True
F = qE + qv X B - Correct answer-Force on charged particle in electric and
magnetic fields
When is a velocity selector used? - Correct answer-when all particles need to move
with the same velocity
A ass spectrometer separates ions according to their mass to charge ratio (T/F) -
Correct answer-True
F = IL X B - Correct answer-Force on a wire with current
dB = mu0/(4pi)*(IdsXr)/(r^2) - Correct answer-Biot-Savart Law
The Biot-Savart law describe the magnetic field due to the current carrying
conductor (T/F) - Correct answer-True
B = (mu0*I)/(2pia) a = distance - Correct answer-B field for a long, straight
conductor (Ampere's Law)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
Answers
A compass can be used to trace field lines (T/F) - Correct answer-True
The lines outside the magnet point from the South pole to the North pole (T/F) -
Correct answer-False, they point North to South
F = qv X B - Correct answer-Force on a charge moving in a magnetic field
Dot signifies a B field.... - Correct answer-out of page
x signifies a B field - Correct answer-into page
When a charged particle moves with a given velocity through a magnetic field, the
field can alter the direction of the velocity (T/F) - Correct answer-True
When a charged particle moves with a given velocity through a magnetic field, the
field can alter the speed and kinetic energy (T/F) - Correct answer-False, the
kinetic energy cannot be altered by the magnetic field alone
A magnetic force causes centripetal acceleration, changing the direction of the
velocity of a particle (T/F) - Correct answer-True
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, F = qvB = (mv^2)/r - Correct answer-Centripetal force in a magnetic field
w = v/r = (qB)/m - Correct answer-Angular speed (cyclotron frequency)
T = (2pir)/v = 2pi/w = (2pim)/qb - Correct answer-Period of motion
In a uniform B field, a charged particle moves in a helical path with respect to the
field (T/F) - Correct answer-True
F = qE + qv X B - Correct answer-Force on charged particle in electric and
magnetic fields
When is a velocity selector used? - Correct answer-when all particles need to move
with the same velocity
A ass spectrometer separates ions according to their mass to charge ratio (T/F) -
Correct answer-True
F = IL X B - Correct answer-Force on a wire with current
dB = mu0/(4pi)*(IdsXr)/(r^2) - Correct answer-Biot-Savart Law
The Biot-Savart law describe the magnetic field due to the current carrying
conductor (T/F) - Correct answer-True
B = (mu0*I)/(2pia) a = distance - Correct answer-B field for a long, straight
conductor (Ampere's Law)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
