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78. In absolute value, Faraday’s law (for a single turn, with
B
changing in time) gives
2
()
B
d
dBA
dB
AR
dt
dt
dt
dt
π
Φ
==
=
for the magnitude of the induced emf.
Dividing it by
R
2
then allows us to relate this to
the slope of the graph in Fig. 3075(b) [particularly the first part of the graph], which we
estimate to be 80
µ
V/m
2
.
(a) Thus,
dB
1
dt
=
(80
µ
V/m
2
)/
π
≈
25
µ
T/s .
(b) Similar reasoning for region 2 (corresponding to the slope of the second part of the
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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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