Question

015 (part 1)
An electron is accelerated by a 6.7 kV poten-
tial difference.
The charge on an electron is 1.60218 ×
10−19 C and its mass is 9.10939 × 10−31 kg.
How strong a magnetic field must be expe-
rienced by the electron if its path is a circle of
radius 5.9 cm?
Answer in units of T.

016 (part 2)
The magnetic force on a straight 0.23 m seg-
ment of wire carrying a current of 4.5 A is 1.6
N.
What is the magnitude of the component
of the magnetic field that is perpendicular to
the wire?
Answer in units of T.

017 ( part 3)
A segment of wire carries a current of 61 A
along the x axis from x = −6 m to x = 0 and
then along the z axis from z = 0 to z = 3.1 m.
In this region of space, the magnetic field is
equal to 21 mT in the positive z direction.
What is the magnitude of the force on this
segment of wire?
Answer in units of N.

018 (part 4)
A wire carrying a current 30 A has a length
0.1 m between the pole faces of a magnet at
an angle 60 ◦ (see the figure). The magnetic
field is approximately uniform at 0.5 T. We
ignore the field beyond the pole pieces.


What is the force on the wire?
Answer in units of N.