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AIEEE 2012 Solved Paper
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© examsnet.com
Question : 60
Total: 89
The figure shows an experimental plot for discharging of a capacitor in an R-C circuit. The time constant
τ
of this circuit lies between
100
s
e
c
and
150
s
e
c
0
and
50
s
e
c
50
s
e
c
and
100
s
e
c
150
s
e
c
and
200
s
e
c
Validate
Solution:
During discharging of a capacitor,
V
=
V
0
e
−
t
τ
At
t
=
τ
,
V
=
V
0
e
=
0.37
V
0
From the graph,
t
=
0
,
V
0
=
25
V
∴
V
=
0.37
×
25
=
9.25
V
This voltage will occur at time between
100
s
e
c
and
150
s
e
c
. Hence, time constant
τ
of this circuit lies between
100
s
e
c
and
150
s
e
c
.
© examsnet.com
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