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11. Electromagnetic Induction
11.1 Electromagnetic induction: ε = BLv
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
How long is a conductor is it
experiences an emf of 1.5 V when
moving at a speed of 9 m s
-1
through a magnetic fi eld of 0.5 T?
What is the emf produced when a
conductor of length 10 cm moves
with a speed of 5 m s
-1
through a
magnetic fi eld of strength 0.2 T?
What is the emf produced when a
conductor of length 15 cm moves
with a speed of 2 m s
-1
through a
magnetic fi eld of strength 0.05 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.
11. Electromagnetic Induction
11.1 Electromagnetic induction: ε = BLv
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
An emf of 2.2 V is measured
across a conductor of length 8 cm
moving through a magnetic fi eld
of 0.1 T. How fast is the conductor
travelling?
An emf of 1.7 V is measured
across a conductor of length 17
cm moving through a magnetic
fi eld at 11 m s
-1
. What is the
strength of the magnetic fi eld?
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.
11. Electromagnetic Induction
11.1 Electromagnetic induction: ε = BLv
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
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.
11. Electromagnetic Induction
11.1 Electromagnetic induction: ε = BLv
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
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.