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38. An electric field with circular field lines is induced as the magnetic field is turned on.
Suppose the magnetic field increases linearly from zero to
B
in time
t
. According to Eq.
3127, the magnitude of the electric field at the orbit is given by
E
rd
B
dt
rB
t
=
F
H
G
I
K
J
=
F
H
G
I
K
J
22
,
where
r
is the radius of the orbit. The induced electric field is tangent to the orbit and
changes the speed of the electron, the change in speed being given by
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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