1
.
A changing magnetic flux induces an electric field;
this is a generalization of Faraday’s law. The electric
field will exist regardless of whether there are any
conductors around:
29-7 A Changing Magnetic Flux Produces an
Electric Field
Example 29-14:
E
produced by changing
A magnetic field
B
between the pole
faces of an electromagnet is nearly
uniform at any instant over a circular
area of radius
r
0
. The current in the
windings of the electromagnet is
increasing in time so that
B
changes in
time at a constant rate
d
B
/
dt
at each
point. Beyond the circular region (
r
>
r
0
),
we assume
B = 0
at all times. Determine
the electric field
E
at any point
P
a
distance
r
from the center of the circular
area due to the changing
B
.
29-7 A Changing Magnetic Flux Produces an
Electric Field
B
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uuur
E
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B
uuur
B
uuur
B
uuur
uuur

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