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5. Electricity and magnetism
5.4 Magnetic effects of current
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
Calculate the magnetic fi eld strength when
an electron experiences a force of 27 mN
perpendicular to a magnetic fi eld of 0.5 T
and moving with a drift speed of 0.005 m
s
-1
.
What is the force on a charged particle if
there is 3 C of charge moving with a drift
speed of 0.02 m s
-1
perpendicular to a
magnetic fi eld of 0.05 T?
What is the force on a a charged particle if
there is 0.25 C of charge moving with a
drift speed of 0.08 m s
-1
in a conductor
perpendicular to a magnetic fi eld of 0.25
T?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
Steps
Practice 3
Practice 4
Practice 5
:
write your own
5. Electricity and magnetism
5.4 Magnetic effects of current
Read the question carefully.
What is the drift speed of the charged
particle of 2 C in a conductor experiencing
a force of 0.3 N perpendicular to a
magnetic fi eld of 0.4 T?
What is the drift speed of the charged
particles in a conductor experiencing a
force of 0.
9
N
35
o
to a magnetic fi eld of
2
.
1
m
T?
Write what you know: highlight/
record the information from the
questions including what you
want to fi nd out.
Convert any data to appropriate
values (for example g to kg, or cm
to m)
Write down the equation that links
the variables together
Rearrange the equation to make
the unknown the subject
Substitute your data into the
equation, including the units
Calculate the answer, leaving a
unit and an appropriate number of
sig fi gs (same as data). Check
that the answer makes sense and
underline.
