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28. Eq. 2723 gives
ε
2
/
R
as the rate of energy transfer into thermal forms (
dE
th
/dt
, which,
from Fig. 3055(c), is roughly 40 nJ/s).
Interpreting
as the induced emf (in absolute
value) in the singleturn loop (
N
= 1) from Faraday’s law, we have
()
B
d
dBA
dB
A
dt
dt
dt
Φ
==
=
.
Eq. 2923 gives
B
=
µ
o
ni
for the solenoid (and note that the field is zero outside of the
solenoid – which implies that
A = A
coil
), so our expression for the magnitude of the
induced emf becomes
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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, Energy

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