Platt, David – Homework 23 – Due: Nov 2 2005, 4:00 am – Inst: Ken Shih
1
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7
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The due time is Central
time.
001
(part 1 of 1) 10 points
A circuit consists of a 32 Ω resistor and a
740 mH inductor connected in series to a 17 V
battery.
What is the value of the current when the
current is increasing at the rate of 4 A
/
s?
Correct answer: 0
.
43875 A.
Explanation:
Let :
R
= 32 Ω
,
L
= 740 mH = 0
.
74 H
,
V
= 17 V
,
and
Δ
i
Δ
i
= 4 A
/
s
.
In an RL circuit
V
=
L
Δ
i
Δ
t
+
i R
i
=
V

L
Δ
i
Δ
t
R
i
=
17 V

(740 mH) (4 A
/
s)
32 Ω
i
= 0
.
43875 A
002
(part 1 of 1) 10 points
In the circuit below a steady current
I
0
is
flowing when the switch is in position “a”. If
the switch is then thrown to position “b”, the
current will decrease to zero after some time.
L
R
E
S
b
a
I
(
t
)
Suppose we replace the inductor with one of
the same area and length, but twice as many
turns.
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 Fall '08
 Turner
 Physics, Work, Magnetic Field, Correct Answer, Inductor, Energy density, Platt, Ken Shih

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