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11. Electromagnetic Induction
11.1 Electromagnetic induction:
𝜱
= BA cos
θ
Steps
Worked example
Practice 1
Practice 2
Read the question carefully.
The magnetic flux is 0.5 Wb m
-2
between a magnetic fi eld of
strength 0.5 T and an area. The
area is a square. What is the
length of one of the sides?
What is the magnetic flux when a
magnetic fi eld of 1.4 T is
perpendicular to an area of
dimensions 5 cm x 15 cm?
What is the magnetic flux when a
magnetic fi eld of 0.7 T is
perpendicular to an area of
dimensions 2 cm x 10 cm?
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:
𝜱
= BA cos
θ
Steps
Practice 3
Practice 4
Practice 5
:
write your own
Read the question carefully.
What is the magnetic flux when a
magnetic fi eld of 1.4 T is
at an
angles of 45
o
to an area of
dimensions 5 cm x 15 cm?
What is the magnetic flux when a
magnetic fi eld of 1.4 T is parallel
to an area of dimensions 5 cm x
15 cm?
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:
𝜱
= BA cos
θ
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:
𝜱
= BA cos
θ
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.
