1.Which one of the following statements concerning the magnetic force
on a charged particle in a magnetic field is true?
is a maximum if the particle is stationary.
is zero if the particle moves perpendicular to the field.
is a maximum if the particle moves parallel to the field.
acts in the direction of motion for a positively charged particle.
depends on the component of the particle's velocity that is perpendicular to
2. Complete the following statement: The magnitude of the magnetic
force that acts on a charged particle in a magnetic field is independent of
sign of the charge.
magnitude of the charge.
magnitude of the magnetic field.
direction of motion of the particle.
velocity components of the particle.
3.A charged particle is moving in a uniform, constant magnetic field.
Which one of the following statements concerning the magnetic force exerted on
the particle is false?
does no work on the particle. (d) It can act
only on a particle in motion.
increases the speed of the particle. (e) It does not
change the kinetic energy of
changes the velocity of the particle. the particle.
4.A proton traveling due east in a region that contains only a
magnetic field experiences a vertically upward force (away from the
surface of the earth). What is the direction of the magnetic field?
(a) north (c) south (e) down
(b) east (d) west
5.A charged particle is fired from a gun with a velocity of 5.2 ´ 104
m/s at an angle of 35° with respect to a 0.0045-T magnetic field. If the
magnetic field exerts a force of 0.0026 N on the particle, determine the
magnitude of the charge.
(a) 11 µC (c) 19
µC (e) 27 µC
(b) 15 µC (d) 23
6.Which one of the following statements best explains why a constant
magnetic field can do no work on a moving charged particle?
magnetic field is conservative.
magnetic force is a velocity dependent force.
magnetic field is a vector and work is a scalar quantity.
magnetic force is always perpendicular to the velocity of the particle.
electric field associated with the particle cancels the effect of the magnetic
field on the
7.An electron traveling due south enters a region that contains a
uniform magnetic field that points due east. In which direction will the
electron be deflected?
(a) east (c) up
(b) west (d) down
8.Two electrons are located in a region of space where the magnetic
field is zero. Electron A is at rest; and electron B is moving
westward with a constant velocity. A non-zero magnetic field directed eastward
is then applied to the region. In what direction, if any, will each electron
be moving after the field is applied?
(b) northward eastward
(d) southward downward,
toward the earth
away from earth westward
9.An electron is moving with a speed of 3.5 ´ 105 m/s
when it encounters a magnetic field of 0.60 T. The direction of the magnetic
field makes an angle of 60.0° with respect to the velocity of the electron.
What is the magnitude of the magnetic force on the electron?
(a) 4.9 ´ 10–13 N (c) 1.7
´ 10–13 N (e) 2.9 ´ 10–14
(b) 3.2 ´ 10–13 N (d) 3.4
´ 10–14 N
Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? (a)