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11. Electromagnetic Induction
11.1 Electromagnetic induction: ε = -NΔ
𝜱
/ Δ
t
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
An aeroplane with a wingspan of
40 m moves at 200 m s
-1
through
the earth’s magnetic fi eld of 5 x
10
-5
T. What is the emf induced?
What is the emf induced when
there is a change of magnetic flux
through a coil of 35 Wb in 4 s?
What is the emf induced when
there is a change of magnetic flux
through 10 turns of a coil of 35
Wb in 4 s?
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 = -NΔ
𝜱
/ Δ
t
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
What is the magnetic flux through
a coil if an emf of 4 V is induced in
0.5 s?
What is the total flux linkage when
an emf of 0.7 V is induced through
a 200 turn coil in 3 s?
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 = -NΔ
𝜱
/ Δ
t
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 = -NΔ
𝜱
/ Δ
t
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.
