nguyen (jmn727) – homework 13 – Turner – (59070)
1
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printout
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have
12
questions.
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001
(part 1 of 3) 10.0 points
A total charge of 12 mC passes through a
crosssectional area of a nichrome wire in 1
.
9 s.
a) What is the current in the wire?
Correct answer: 0
.
00631579 A.
Explanation:
Let :
Δ
Q
1
= 12 mC
and
Δ
t
1
= 1
.
9 s
.
I
=
Δ
Q
Δ
t
=
0
.
012 C
1
.
9 s
=
0
.
00631579 A
.
002
(part 2 of 3) 10.0 points
b) How many electrons pass through the
crosssectional area in 35.0 s?
Correct answer: 1
.
38158
×
10
18
.
Explanation:
Let :
q
e
= 1
.
6
×
10

19
C
and
Δ
t
2
= 35
.
0 s
.
Δ
Q
=
N q
e
N
=
Δ
Q
q
e
=
I
Δ
t
2
q
e
=
(0
.
00631579 A)(35 s)
1
.
6
×
10

19
C
=
1
.
38158
×
10
18
.
003
(part 3 of 3) 10.0 points
c) If the number of charges that pass through
the crosssectional area during the given time
interval doubles, what is the resulting cur
rent?
Correct answer: 0
.
0126316 A.
Explanation:
Let :
Δ
Q
2
= 2 Δ
Q
1
.
I
=
2 Δ
Q
1
Δ
t
1
=
2 (0
.
012 C)
1
.
9 s
=
0
.
0126316 A
.
004
(part 1 of 2) 10.0 points
The current in a conductor varies over time as
shown in the figure.
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
Current(A)
Time(s)
How much charge passes through a cross
section of the conductor in the time interval
t
= 0 s to
t
= 5
.
5 s?
Correct answer: 19 C.
Explanation:
Let :
Δ
t
= 5
.
5 s
.
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 Spring '08
 Turner
 Charge, Work, Ratio, Resistor, Electric charge, Electrical resistance, E1 E2 E1

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